Cast

• Kim Soo-hyun — Song Sam-dong
• Bae Su-ji — Go Hye-mi
• Ok Taec-yeon — Jin-guk
• IU — Kim Pil-Sook
• Hahm Eun-jung — Yoon Baek-hee
• Jang Woo-young — Jason
• Kang So-ra — Shin Hae-sung
• Jeong Jin-woon — Jin Yoo-jin
• Lim Jae-beom — JB/Jang Woo-jae
• JIYEON — Ri-an/Lee Ji-kyung
• Park Seo-jun — Lee Si-woo
• Kim Hyo-jung — Na-na/Kim Jae-hee
• Uhm Ki-joon — Kang Oh Hyuk
• Lee Hye-Sook — Sam-dong's mother, Song Nam-boon
• Ailee — Ailee
• Park Jin-young — Jung Ui-Bong