Forgotten

Kang Ha-neul

Jin-seok

Kim Moo-yul

Yoo-seok / Choi Seong-uk

Moon Sung-keun

Jin-seok's Father / Mr. Park

Na Young-hee

Jin-seok's Father / Madam Min

Nam Myung-ryeol

Professor Choi

Lee Na-ra

Professor Choi's Wife

Jeong Taek-hyeon

High School Yoo-seok

Jung Chan-bi

Girl

Choi Go

Young Yoo-seok

Bae Seong-il

Questionable Man 1

Lee Soon-won

Questionable Man 2

Byeon Dong-joon

Questionable Man 3

Kang Sin-goo

Jin-seok's Real Father / Precinct Policeman 4

An Min-young

Jin-seok's Real Mother

Park Jae-yeong

Jin-seok's Real Brother