Main •
Kim Sung-cheol as Park Jung-min, an aspiring singer-songwriter who has suffered from stage phobia ever since his voice cracked in front of his first love. •
Jung Chae-yeon as Kwon Na-ra, a member of an unsuccessful girl group on the brink of obscurity who is attempting to revive her career.
Supporting • Choi Yoo-ri as Park Ok-hee, Jung-min's younger sister. •
Park Mi-sun as Kim Mi-ok, Jung-min's mother. •
Yang Ik-june as Kim Hyung-soo, Jung-min's uncle. •
Lee Sang-yi as Yeom Dae-sung, Jung-min's friend. • Nam Tae-boo as Kim Min-bong, Jung-min's friend. •
Jo Kwan-woo as the CEO of Kwon Na-ra's agency •
NC.A as Eileen, a rival singer at Kwon Na-ra's agency •
Kim Junwook as a performer •
Jeong Sagang as a performer ==Soundtrack==