As labelmates, 2AM and 2PM members have frequently appeared together on
YouTube videos and
variety TV programs such as
Win Win,
Star King,
Star Golden Bell, and
Strong Heart, collaborated together on songs, and performed together at
JYP Nation concerts. In 2009, as part of a project for 2PM's variety show
Wild Bunny, 2AM members
Jo Kwon and
Lim Seul-ong joined
Ok Taec-yeon,
Jang Wooyoung, and
Hwang Chan-sung in filming a parody music video of
Brown Eyed Girls' song "
Abracadabra" under the group name of Dirty Eyed Girls. In 2010, Jo Kwon and Ok Taec-yeon were cast together for the
second season of
SBS's popular variety show
Family Outing, and Jo Kwon and
Nichkhun were both cast members of the
second season of
MBC's variety show
We Got Married, where they occasionally appeared in episodes together. Also in 2010, 2AM also made a guest appearance at 2PM's first concert titled Don't Stop Can't Stop, and
Hwang Chan-sung collaborated with 2AM on the song "To Her" (그녀에게) from 2AM's first EP ''
Can't Let You Go Even If I Die''. At the end of the year, 2PM and 2AM were among the JYP Nation artists who worked on the single "This Christmas", released prior to JYP Nation's 2010 concert. In 2011, 2AM members Jo Kwon and Lim Seul-ong made a guest appearance on the August 20 episode of 2PM's variety show
2PM Show! From April 3, 2012 to September 25, 2012, 2AM and 2PM hosted a Japanese television show on
Tokyo MX titled
Wander Trip, in which members of both groups traveled through Japan and experienced Japanese culture. Also in April 2012, a Japanese documentary film featuring 2AM and 2PM titled
Beyond the One Day ~Story of 2PM and 2AM~ was announced. The trailer for the film was released on April 13, with the film itself premiering on June 30. The theme song of the documentary, "
One Day", was released as a digital single on July 4 as a collaboration between 2AM and 2PM, peaking at number five on the
Oricon Singles Chart. The B-side track "No Goodbyes" was included in the single, and a live version of 2PM's song "Angel" from their debut single
Hottest Time of the Day was included as a CD-only bonus track. In 2014,
Ok Taec-yeon and
Lim Seul-ong collaborated on the song "U Don't Know", which they composed and wrote together. The song released as part of the live album ''JYP Nation Korea 2014 'One Mic'
and, along with other collaborative stages between One Day members, was performed during the 2014 JYP Nation concert in South Korea. Also included in the live album were a live recording and a studio recording of a Korean rendition of the song "No Goodbyes", originally a Japanese B-side track for One Day''. 2AM would then go on hiatus in 2015 as their members began leaving JYP Entertainment, followed by 2PM's hiatus starting in 2017 as their members began their
mandatory military service. For example, on January 24, 2018, Jo Kwon and
Jang Wooyoung appeared together on MBC's
Radio Star, and on March 14, 2019, Hwang Chan-sung and
Jeong Jin-woon appeared together on
Channel A's fishing show
The Fisherman and the City. On April 4, 2020, Jo Kwon and Jang Wooyoung made a guest appearance together on
JTBC's variety program
Knowing Bros, the first variety TV show appearance for both since being discharged from the military. In 2021, 2AM and 2PM both ended their hiatuses with the release of comeback albums.
Lee Jun-ho starred in two music videos for
2AM's songs, "Should've Known" (가까이 있어서 몰랐어;
Gakkai Isseoseo Mollasseo) and "No Good in Good-Bye" (잘 가라니;
Jal Garani) from their comeback EP
Ballad 21 F/W. Also in 2021, Jo Kwon reunited with former 2PM member
Jay Park during the October 12 episode of Mnet's dance competition TV show
Street Woman Fighter, which was the first time the two were seen interacting since Park's departure from 2PM in 2009. In 2024, Hwang Chan-sung and
Lee Chang-min, both of whom are signed to the agency HIAN Inc. for their activities in Japan, collaborated with Japanese hip-hop artist
AK-69 on the Japanese single "Into the Fire", which was also used as the theme song for the anime television series adaptation of
Re:Monster. In 2025, Lee Jun-ho appeared on Lim Seul-ong's newly-launched YouTube channel, OngStyle, in his first YouTube video. == Discography ==