Predebut
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. JoKwon trained for 2567 days, 10 days past 7 years after joining JYPE.
2AM's First Single Album
Mid-2008: Debut
2AM's first single "This Song" release July 21, 2008 and made their debut performance on July 11, 2008 performing their debut song "이 노래"("This Song" .
Early-2009: 2nd Single Album
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.
Early-2010: 1st Mini-Album
"Even If I Die I Can't Let You Go"
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 released a total of five 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
"I Was Wrong"
2AM revealed on March 5th, 2010 through their official home page cuts of their new image. Jo Kwon, Changmin, Seulong, and Jinwoon respectively transformed as 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 will feature 4 additional songs, 3 from their first and second singles and one entirely new song titled "잘못했어" ("I Was Wrong"), which would be 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 10th[4], where the members playfully sing along to it in their car. 4 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 showcas. The album was released on March 18, 2010.
