Main •
Kim Min-jae as Park Joon-young •
Park Sang-hoon as young Park Joon-young •
Park Eun-bin as Chae Song-ah •
Kim Sung-cheol as Han Hyun-ho •
Park Ji-hyun as Lee Jung-kyung •
Shin Soo-yeon as young Lee Jung-kyung •
Lee You-jin as Yoon Dong-yoon •
Bae Da-bin as Kang Min-sung
Supporting Kyunghoo Cultural Foundation •
Ye Soo-jung as Na Moon-sook • Kim Jong-tae as Lee Sung-geun •
Seo Jeong-yeon as Cha Young-in •
Choi Dae-hoon as Park Sung-jae • Ahn Sang-eun as Jung Da-woon • Lee Ji-won as Kim Hae-na • Yang Jo-ah as Im Yoo-jin
Seoryeong University •
Gil Hae-yeon as Song Jeong-hee •
Baek Ji-won as Lee Soo-kyeong • Joo Seok-tae as Yoo Tae-jin
People around Chae Song-ah •
Kim Hak-sun as Song-ah's father • Kim Sun-hwa as Song-ah's mother • Lee Noh-ah as Chae Song-hee, Song-ah's elder sister
Others •
Kim Jung-young as Park Joon-young's mother • Ko So-hyun as Yang Ji-won, violinist •
Kim Gook-hee as Ji-won's mother • Yoon Chan-young as Seung Ji-min, pianist • Kim Mi-kyung as maestro ==Production==