Bae Hyun-sung

Seung-jo (season 2)

Lee Kang-san: an unidentified boy who has lost his memory due to an accident, and develops a mysterious ability to feel the pain and despair of others and read their minds.

Park Ha-neul

Baek Ma-tan

Jung Hyun, a 18-year-old high school student born in Jeju.

Jang Hong-do, third-year medical student, later intern and Yun-bok's twin brother.

Bae Yun-sung, an intern staff.