Battle participated in the 2005 coke play battle shinhwa audition event co-operated by Coca-Cola and good and was selected as a new generation trainee of good company. He was selected one-on-one by Shinhwa members! At that time, Zhang Xian was selected as the successor by Dongwan. , but later quit the battle group due to being unable to withstand the hard training during training, and was replaced by Kim Tae-gwan.