Min-gu (played by Kim Seung-woo) is a protagonist in Twenty Again.
Min-ha (played by Lee Tae-ran) appears in Twenty Again.
Su-mi (played by Mun Ka-young) appears in Twenty Again.
Han‑bit (played by Jeong Joon-won) appears in Twenty Again.
Mi-ra (played by Hwang Young-hee) appears in Twenty Again.
Han‑byeol (played by Lee Do-yeon) appears in Twenty Again.
Nurse (played by Yoon Ga-hyun) appears in Twenty Again.
