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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".
For In Heaven, Park co-wrote "Get Out" with bandmate Jaejoong.
He portrayed Lee Seon Joon, a wealthy, passionable and studious nobleman, who falls in love with his fellow schoolmate—a woman disguised as a man.Park Yoo-chun (born June 4, 1986), formerly known as Micky Yoochun and better known by the mononym Yoochun, is a South Korean singer-songwriter and actor.He is a member of the South Korean boy group JYJ and former member of TVXQ.For the group's Japanese releases, Park wrote and co-composed "Kiss Shita Mama, Sayonara" Park has also written songs for JYJ's albums."I Love You", a track featured in JYJ's 2010 album The Beginning, was penned by Park.
From 2003 to 2009, Park performed as a member of the best-selling K-pop boy band TVXQ. Through their lawyers, the members stated that the 13-year contract was excessively long, schedules were held out without the confirmation or permission of the members, contract terms have been extended and changed without their knowledge or consent and that the group's earnings were not fairly distributed to the members.