K-pop idol group CNBLUE’s lead singer Jung Yong-hwa, who recently kicked off his solo career, showed off his abdominal muscles on Thursday.

The singer uploaded a shirtless photo of himself on Twitter, saying “One Fine Day,” a reference to his newly released single.

Fans were pleasantly surprised at his defined abs, posting, “When did Jung Yong-hwa build up this much muscle?,” “This is a piece of art,” “Jung now joins in the fit bodies group.”

By Lim Jeong-yeo ()