Question: why did jyj sue sm?
Answer: Former TVXQ members Jaejoong, Yoochun, and Junsu, now known as JYJ, filed a lawsuit against SM Entertainment on July 31, 2009. ... They wanted the JYJ members to pay back the monetary loss that was caused by JYJ refusing to participate in concerts, CFs, and other schedules from the start of the lawsuit to the end.