During the sit-down chat, the brothers revealed that they actually went to therapy together for a year prior to their professional reunion.
"We literally spent a year basically doing therapy, working through some things and figuring out what this chapter would look like," Nick explained. "We've had to be really open and honest. There are things in the past that bothered us from time to time, even in our performances that we would do."
Nick then went into detail about how the idea for them to reunite first came to be.
"About a year and a half ago, we started filming a documentary… [that] tracks kind of our childhood into our time in the band, and it was gonna be a story about where we are today," Nick shared. "With separate lives, doing separate things -- Joe with DNCE, me with my solo stuff."
Jonas Brothers through the years
Jonas Brothers through the years
UNIVERSAL CITY, CA - AUGUST 20: (L-R) Nicholas Jonas, Kevin Jonas and Joseph Jonas of The Jonas Brothers arrive at the 8th Annual Teen Choice Awards at the Gibson Amphitheatre on August 20, 2006 in Universal City, California. (Photo by Frazer Harrison/Getty Images)
ANAHEIM, CA - JULY 22: (L-R) Joseph Jonas, Kevin Jonas and Nicholas Jonas of The Jonas Brothers pose backstage at the Radio Disney Totally 10 Birthday Concert held at the Arrowhead Pond of Anaheim on July 22, 2006 in Anaheim, California. (Photo by Kevin Winter/Getty Images for Radio Disney)
NEW YORK - DECEMBER 30: (ITALY OUT, NY DAILY NEWS OUT, NY NEWSDAY OUT) (L-R) Joseph Jonas, Nicholas Jonas and Kevin Jonas of the Jonas Brothers pose with a fan on December 30, 2007 in New York City. (Photo by Arnaldo Magnani/Getty Images)
Nick Jonas, Joe Jonas and Kevin Jonas of The Jonas Brothers pose in the press room for Z100's Jingle Ball 2007 at Madison Square Garden on December 14, 2007 in New York City. (Photo by Jim Spellman/WireImage)
Jonas Brothers perform at Z100's Jingle Ball 2007 at Madison Square Garden on December 14, 2007 in New York City. (Photo by Kevin Mazur/WireImage)
Jonas Brothers: Nick Jonas & Joe Jonas & Kevin Jonas appearing in the 2007 Macy's Thanksgiving Day Parade, New York City. November 22, 2007 (Photo by Walter McBride/Corbis via Getty Images)
Musical act The Jonas Brothers appear at the Verizon store on November 20, 2007 in Boca Raton, Florida (Photo by Jeff Daly/FilmMagic)
The Jonas Brothers arrive at the 2007 American Music Awards in Los Angeles. (Photo by Frank Trapper/Corbis via Getty Images)
NEW YORK - DECEMBER 31: (L-R) Musicians Nick Jonas, Joe Jonas and Kevin Jonas of the Jonas Brothers perform onstage during Dick Clark's New Year's Rockin' Eve 2009 With Ryan Seacrest on December 31, 2008 in New York City. (Photo by Bryan Bedder/Getty Images for DCPNYE)
The Jonas Brothers pose in the photo room at the nominations announcement for the 51st Grammy Awards, on December 3, 2008 at the Noika Theatre at LA Live in downtown Los Angeles, California. AFP PHOTO / ROBYN BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)
NEW YORK - NOVEMBER 28: ( L-R) Kevin Jonas, Joe Jonas and Nick Jonas sign copies of 'Burning Up: On Tour with the Jonas Brothers' at Barnes & Noble 5th Avenue on November 28, 2008 in New York City. (Photo by Gilbert Carrasquillo/FilmMagic)
IRVING, TX - NOVEMBER 27: (L-R) Nick Jonas, Joe Jonas, and Kevin Jonas of The Jonas Brothers perform during halftime between the Seattle Seahawks and the Dallas Cowboys at Texas Stadium on November 27, 2008 in Irving, Texas. (Photo by Ronald Martinez/Getty Images)
DISNEY PARKS CHRISTMAS DAY PARADE - 'Tis the season to be merry at Disney Parks, when the 26th annual 'Disney Parks Christmas Day Parade,' featuring award-winning musical talent and iconic stars performing in this year's television special, airs December 25 (10:00 a.m.-12:00 p.m., ET) on the ABC Television Network. (Photo by Matt Stroshane/ABC via Getty Images) JONAS BROTHERS
COLOGNE, GERMANY - NOVEMBER 15: (L-R) Nick Jonas, Joe Jonas and Kevin Jonas of Jonas Brothers perform onstage at The Palladium on November 15, 2009 in Cologne, Germany. (Photo by Rob Hoffman/JBE/Getty Images)
MADRID - NOVEMBER 12: (L-R) Kevin Jonas, Joe Jonas and Nick Jonas of the Jonas Brotherspose during a visit as guests of Real Madrid as they visit Santiago Bernabeu on November 12, 2009 in Madrid, Spain. (Photo by Victor Carretero/Real Madrid via Getty Images)
MADRID, SPAIN - NOVEMBER 11: (L-R) Nick Jonas, Joe Jonas and Kevin Jonas of Jonas Brothers perform at Palacio de Deportes on November 11, 2009 in Madrid, Spain. (Photo by Rob Hoffman/JBE/Getty Images)
(L-R) Kevin Jonas, Joe Jonas and Nick Jonas of The Jonas Brothers pose to photographers during a press conference to promote a concert and the movie 'Camp Rock 2 The Final Jam' at Four Seasons Hotel on October 24, 2010 in Mexico City, Mexico.
LONG BEACH, CA USA -- Nick Jonas, left, Kevin Jonas, center, and Joe Jonas before their softball game at Blair Field in Long Beach, CA on September 19, 2010. The Jonas Brothers' team, the Road Dogs, defeated the Marquis Flyers 7 to 15..
(Photo by Jeff Gritchen/Digital First Media/Orange County Register via Getty Images)
WASHINGTON, DC - MAY 1: Jonas Brothers arrives at the annual White House Correspondents Association dinner at the Washington Hilton in Washington, DC on May 1, 2010. (Photo by Linda Davidson / The Washington Post via Getty Images) StaffPhoto imported to Merlin on Sat May 1 19:25:03 2010
(L-R) Nick Jonas, Joe Jonas and Kevin Jonas of The Jonas Brothers perform at the 2011 Concert For Hope at Gibson Amphitheatre on March 20, 2011 in Universal City, California.
(L-R) Nick Jonas, Kevin Jonas and Joe Jonas of The Jonas Brothers attend the 2011 Concert For Hope at Gibson Amphitheatre on March 20, 2011 in Universal City, California.
LAS VEGAS, NV - SEPTEMBER 16: : (L-R) Recording artist Kevin Jonas, Danielle Jonas, recording artist Joe Jonas, model Blanda Eggenschwiler, recording artist Nick Jonas and Miss Universe 2012 Olivia Culpo arrive at XS The Nightclub at Encore Las Vegas to celebrates Nick Jonas's 21st birthday on September 16, 2013 in Las Vegas, Nevada. (Photo by David Becker/WireImage)
LOS ANGELES, CA - DECEMBER 01: (L-R) Musicians Kevin Jonas, Joe Jonas and Nick Jonas of the Jonas Brothers attend KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 1, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)
GOOD MORNING AMERICA - The Jonas Brothers officially announced they were splitting upduring a GOOD MORNING AMERICA' exclusive, 10/30/13, airing on the ABC Television Network. (Photo by Ida Mae Astute/ABC via Getty Images)
KEVIN JONAS, JOE JONAS, NICK JONAS
ST PAUL, MN - OCTOBER 08: The Jonas brothers pose during the red carpet before the We Day Minnesota event at the Xcel Energy Center in St. Paul, Minnesota on October 8, 2013 (Photo by Adam Bettcher/Getty Images for Free the Children)
LAS VEGAS, NV - SEPTEMBER 14: Recording artists Nick Jonas (L), Joe Jonas (3L) and Kevin Jonas (2R) pose for photos with cast members of Le Reve at Wynn Las Vegas on September 14, 2013 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/WireImage)
NEW YORK, NY - SEPTEMBER 06: (L-R) Kevin Jonas, Nick Jonas and Joe Jonas of Jonas Brothers attends 2014 Mercedes-Benz Fashion Week during day 2 on September 6, 2013 in New York City. (Photo by Gilbert Carrasquillo/FilmMagic)
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"But during [filming and production], we started to realize that there was a magic that we felt like we were missing," he continued. "So the process was basically just [us saying], 'Why don't we give this another shot?'"
"So we started playing a little music together and realized right away this is where we're meant to be in our lives at this moment," he added, to the roaring and supportive cheering of the crowd.
Later in the show, Corden challenged the siblings to a fun game of "Spill Your Guts or Fill Your Guts," where they had to either answer a question or eat the nasty food in front of them, which included plates of things like "beetle marmalade toast" and "worm spaghetti."
Corden awkwardly asked the guys everything from "If you had to buy a Nick Jonas album or a DNCE album, which one would you buy?" to "Name the most famous person who's hit on you."
However, the brothers' heartwarming backstory behind their decision to get the band back together is a far cry from the hilarious explanation Corden gave in a pretaped intro to Monday's show.
As seen in the short intro, Corden and his bandleader, Reggie Watts, depressed at the state of the world and the stream of bummer news stories, longs to return to the good old days of 2013, when the world was a simpler place and the Jonas Brothers were the musical champions of all things good and wholesome.
Joe Jonas out and about
Joe Jonas out and about
TODAY -- Pictured: Joe Jonas on Thursday, December 6, 2018 -- (Photo by: Nathan Congleton/NBC/NBCU Photo Bank via Getty Images)
Joe Jonas kicked off JCPenney's national Giving Spree in New York City.
NEW DELHI, INDIA - DECEMBER 4: Nick Janoss brother Joe Jonas with his fiancé Sophie Turner pose for photos during wedding reception of Bollywood actor Priyanka Chopra and American singer Nick Jonas at Taj Palace on December 4, 2018 in New Delhi, India. (Photo by Manoj Verma/Hindustan Times via Getty Images)
MUMBAI, INDIA - NOVEMBER 26: Bollywood actor Priyanka Chopra (L) with her fiancee Nick Jonas (R), his brother Joe Jonas and his fiancee Sophie Turner posed for photographs outside a restaurant at Juhu on November 26, 2018 in Mumbai, India. (Photo by Prodip Guha/Hindustan Times via Getty Images)
LOS ANGELES, CA - NOVEMBER 19: Joe Jonas is seen on November 19, 2018 in Los Angeles, California. (Photo by gotpap/Bauer-Griffin/GC Images)
SHANGHAI, CHINA - NOVEMBER 15: American singer and actor Joe Jonas attends Louis Vuitton Volez Voguez Voyagez Exhibition on November 15, 2018 in Shanghai, China. (Photo by VCG/VCG via Getty Images)
LOS ANGELES, CALIFORNIA - NOVEMBER 07: Nick Jonas and Joe Jonas attend a basketball game between the Los Angeles Lakers and and the Minnesota Timberwolves at Staples Center on November 07, 2018 in Los Angeles, California. (Photo by Allen Berezovsky/Getty Images)
BEVERLY HILLS, CA - OCTOBER 16: Joe Jonas attends the FENDI MANIA Capsule Collection Launch Event at Fendi on October 16, 2018 in Beverly Hills, California. (Photo by Stefanie Keenan/Getty Images for Fendi)
NEW YORK, NY - OCTOBER 05: Joe Jonas is seen in NoHo on October 5, 2018 in New York City. (Photo by Gotham/GC Images)
PARIS, FRANCE - OCTOBER 02: Sophie Turner and Joe Jonas attend the Louis Vuitton show as part of the Paris Fashion Week Womenswear Spring/Summer 2019 on October 2, 2018 in Paris, France. (Photo by Bertrand Rindoff Petroff/Getty Images)
PARIS, FRANCE - OCTOBER 01: Joe Jonas and Sophie Turner are seen leaving a restaurant on October 1, 2018 in Paris, France. (Photo by Pierre Suu/Getty Images)
NEW YORK, NY - SEPTEMBER 21: Joe Jonas is seen in SoHo on September 21, 2018 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - SEPTEMBER 04: Sophie Turner, Joe Jonas, Nick Jonas, Priyanka Chopra at 2018 US Open at the 2018 US Open on September 4, 2018 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - SEPTEMBER 4: Sophie Turner and boyfrend Joe Jonas, Priyanka Chopra, wearing her engagement ring and her fiance Nick Jonas attend Serena Williams' quarter-final victory on day 9 of the 2018 tennis US Open on Arthur Ashe stadium at the USTA Billie Jean King National Tennis Center on September 4, 2018 in Flushing Meadows, Queens, New York City. (Photo by Jean Catuffe/GC Images)
NEW YORK, NY - SEPTEMBER 3: Joe Jonas and Sophie Turner attend the defeats of Maria Sharapova and Roger Federer on day 8 of the 2018 tennis US Open on Arthur Ashe stadium at the USTA Billie Jean King National Tennis Center on September 3, 2018 in Flushing Meadows, Queens, New York City. (Photo by Jean Catuffe/GC Images)
NEW YORK, NY - SEPTEMBER 03: Kevin Jonas and Joe Jonas at Day 8 of the US Open held at the USTA Tennis Center on September 3, 2018 in New York City.
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In an effort to save the world, Corden and Watts travel the nation in search of the three members and then forcibly kidnap them, tie them to a chair and demand that they reunite.
While it may not be the real story behind the band's reunion, we can all hold out hope that the Jonas Brothers might bring a sense of harmony back to the world.