In January 25, 2011, JYJ released Korean extended play Their Rooms "Our Story"." JYJ's second group album and first full length Korean-language album In Heaven was released September 28, 2011.

Park Yoo-chun was born on June 4, 1986 in Seoul, South Korea to a wealthy family. He lived in Fairfax, Virginia, where he attended Holmes Middle School and Chantilly High School. In 2001, he won award at American Music Festival and then returned to Korea to prepare for his debut.

After a relatively short training period of 1 year and 5 months, he made his debut as a member of the 5-member male group Dong Bang Shin Ki through SBS Bo A & Britney Spears Special Stage on December 27, 2003.

In January 2011, Park was the lyricist/composer in JYJ's music essay called Their Rooms "Our Story" for the song "이름없는 노래 Part 1 (A Song Without A Name, Part 1)".

In addition, he also composed the rap in bandmate Junsu's song, "Xiahtic".

Park also wrote and composed "사랑 안녕 사랑 (Love Bye Love)", featured on the group's fourth Korean studio album Mirotic.

With TVXQ members U-Know Yunho and Xiah Junsu, Park wrote the rap lyrics to "Love After Love", which appeared on their second Korean studio album, Rising Sun.Yoochun in particularly enjoys driving fast cars, so he was very happy at the prospect of sitting on a motorbike.The publishers stated, "Yoochun, who had previously shown only a gentle charisma, is starting to reveal his actual tough masculinity.Jang Miri is a woman who is willing to put herself in a dangerous relationship to gain success.Kim Seung Woo plays a character who was born into a poor family, but is focused on being No. He is calm and sensible, and became a hotel manager.He is a member of the South Korean boy group JYJ and former member of TVXQ.