It Was Better Before

Four friends Jisoo Junseong Yunsu and Heechul are active in an indie rock band Jisoo who plays the role of a vocalist sings well but doesnt work hard He does not keep practice time every day and has an impulsive personality Looking at Jisoo who is insincere in practice the other 3 decide to find a new vocalist Can we find someone who sings as well as Jisoo