2AM is a South Korean four-member ballad boy band under JYP Entertainment. The members are Jinwoon, Jo Kwon, Seulong, and Changmin. 2AM is one of the two subgroups branched out from the eleven-member (before Jaebeom's departure) boy band One Day, the other being 2PM. They officially debuted on July 11, 2008 on KBS's Music Bank, performing their debut song "This Song". They won their first Mutizen at Inkigayo on February 7, 2010 with "Can't Let You Go Even If I Die".
Along with the members of 2PM, 2AM appeared on the documentary Hot Blood that was aired on Mnet, documented their rigorous training program of their pre-debut days. Changmin was the only member of One Day to not appear in the documentary because he was serving in the military at that time. Initially, Jinwoon was eliminated on Hot Blood, but he ended up in 2AM due to Daehun's withdrawal from JYPE. Jo Kwon trained for 2567 days, 10 days past 7 years after joining JYPE.
2AM's first single, "This Song", was released on July 21, 2008. They made their debut performance on July 11, 2008, performing their debut song "이 노래 (This Song)".
2AM made a comeback with another single album, "Time For Confession", on March 19, 2009 with "친구의 고백 (Confession of a Friend)" being the title track.
2010–Present: 1st Mini Album and Saint o'Clock
2AM made a comeback with a second album, "죽어도 못 보내", on January 21, 2010 with "죽어도 못 보내 (Even If I Die I Can't Let You Go)" as the promoted track. In the week before the release, JYP Entertainment revealed a total of four teasers on their Youtube account. Along with a group teaser, the individual shots were based on the seasons. On February 7, 2010, 2AM won their first Mutizen award on Inkigayo since their debut. On February 25, 2010, their second win was on Mnet M! Countdown. They won a second Mutizen on their final day of promotions for "죽어도 못 보내 (Even If I Die I Can't Let You Go)" on March 7, 2010. On March 5, 2010, 2AM revealed cuts of their new image through their official website. Jo Kwon, Changmin, Seulong, and Jinwoon respectively transformed to a club DJ, an ice hockey player, a biker, and a basketball player for their new 10 minute drama-music video. The repackaged mini album featured four additional songs, three from their first and second singles and one entirely new song titled "잘못했어 (I Did Wrong)", which was their promoted track. One representative stated, “The song we’re releasing is something that 2AM has never shown before and is a brand new type of music”. A portion of the song was revealed in the first episode of 2AM's new reality show 2AM DAY on March 10, where the members playfully sing along to it in the car. Four teasers were released for each member from March 12 to March 14. A leaked version of Part 1 of the music video was released on March 15, having been recorded by camera at 2AM's subway showcase. The album was released on March 18, 2010 and "I Was Wrong" won the Mnet M! Countdown on April 1, 2010.
From June 30, 2010 to July 20, 2010, 2AM opened for Wonder Girls on the second leg of Wonder Girls World Tour. 2AM is also featured in Made in Wonder Girls.
On October 26, 2010, 2AM released their first full-length album entitled Saint o'Clock, with "전활 받지 않는 너에게 (You Wouldn't Answer My Calls)" and "미친 듯이 (Like Crazy)" as the promoted tracks.
Tours2AM held their first concert entitled "Saint o'Clock" in Seoul at Korea University, Hwajeong Gym from December 24 to 26, 2010. 2AM serenaded the crowd with their hit songs such as "You Wouldn't Answer My Calls" and "Like Crazy". 2AM also performed a series of girl group medley such as Wonder Girls's "So Hot", 4 Minute's "Hot Issue" and miss A's "Bad Girl Good Girl". The crowd went crazy when 2AM danced to After School's "Bang!" as the boys are also dressed in aqua blue cheerleader outfits. For their solo stages, Changmin wowed the crowd with Tom Jones's "Sex Bomb" and also ripped his shirt. Seulong danced to "Beautiful Monster" and also revealed his chiseled abs. Jinwoon performed Muse's "Hysteria" with his electric guitar and Jo Kwon danced to Lady Gaga's hit song "Telephone". The guests for the three-day concert includesB2ST, 8eight, Lim Jeong Hee, IU and T-ara.
2AM endorsed up to $1 million for products commercials in early 2010, including Pepsi and BHC Chicken.It was also announced that 2AM would be the new faces of Samsung's Dugeunduguen Tomorrow campaign with Kara, succeeding 4Tomorrow in 2009.
In April 2010, they participated in the original soundtrack of drama series Personal Taste with a ballad titled "바보처럼 (Like A Fool)", which also became a number one hit.
2AM was chosen to represent Asia on Listen Up! The Official 2010 Fifa World Cup Album with the song titled "No. 1". The song was digitally released on May 18, 2010.
Members activity outside of the group
Seulong and Jo Kwon were part of "Dirty Eyed Girls" on an episode of 2PM's reality show Wild Bunny. The music video became extremely popular.
Jo Kwon was paired with Brown Eyed Girls' member Ga In as an imaginary married couple on We Got Married Season II. Seulong and Jinwoon also make regular appearances as commentators on the show. Seulong debuted as an actor in drama series Personal Preference, which starts airing on March 31, 2010. In June 2010, Seulong collaborated with IU for the song "잔소리 (Nagging)", which topped several online music charts.
In 2010, Jo Kwon became a permanent member of Family Outing Season 2. Jo Kwon is also casted in the upcoming MBC sitcom All My Love, which starts airing on November 8, 2010.
Jinwoon was a part of Idol Maknae Rebellion ("아이돌 막내반란시대").