A 3-man Korean/Japanese boy band, originally from the group TVXQ Before they split up into to two groups due to legal reasons with the record company. JYJ consists of Jesung, Yoochun, and Jaejoong.

JYJ has debuted with a Japanese single "Itsudatte Kimi Ni" and has been well received. Shortly after, Some stupid jackasses thought that they would be successful in the states. So, The single that was sung in English, "Ayy girl" was produced. The single has had mixed reactions but did not make it in the states. After said song was released, their next song, sung in their native language, Korean, "In Heaven" The single has been very well received and stands as one of their best.

JYJ shares a fanbase with TVXQ, Cassiopeia, since JYJ is technically still with TVXQ with Yunho and Changmin. Cassiopeia has the Guinness world record for Largest Fanbase in the world.
JYJ is my favorite boy band

person 1:You gonna see the JYJ concert tonight?

person 2:yeah, but I wish they were with TVXQ again...

person 1:Yeah...
by UltraNoobXD January 02, 2012
Get a JYJ mug for your cousin Manafort.