On January 15, 2008, Wu Yi Fan left for a foreign country to become an SM Entertainment trainee to fulfill his dream of becoming an artist. After signing with SM, SM delayed his debut date for a prolonged period again and again. In 2012, Wu Yi Fan debuted, and in 2013, he discovered that a recording he'd practiced for during 10 days had been suddenly canceled. When he asked a manager for the reason, SM Entertainment suggested that he be removed from EXO for several months and other entertainment developments were stopped on purpose. After a lot of negotiating, he was able to return to the group, but afterwards, he continued to encounter unfair situations, pressure, and limited resources. When he returned, discrimination by his manager caused a lot of tension, and he encountered unreasonable, difficult work hours with not enough rest, which drastically impacted his health. Since July of 2013, he's been receiving injections and IV drips to keep up with his work schedule. In January 2014 when he returned to China, his checkup indicated signs of myocarditis. Despite this, SM was unable to get Wu Yi Fan treatment or recuperation. SM was also unfair about distribution of income, putting limits on his development and preventing future development from taking place. Because of this, Wu Yi Fan lost his trust in the label's management.