Park Bo-young

Jung Da-eun: a third-year nurse who gets transferred from Internal Medicine to the Psychiatric Department.

Tak Dong-kyung

Go Se-yeon (after reincarnation) / Lee Mi-do (before plastic surgery) Kim Sa-rang as Go Se-yeon (before her death) Lee Soo-min as young Go Se-yeon

Do Bong-soon Shin Bi as young Do Bong-soon

Na Bong-sun

: young Ma-ri

Woo-yeong (우영), Chil-woo's younger sister

Lee Eun-soo

Young So-hwa

Young Yoo-hee

Shim Chung-ah

Cha Ah-rang