Melting Me Softly

Go Mi-ran (24/44)

Old Byung-shim (44)

Son Hyeon-gi (48), Dong-chan's junior colleague Lee Hong-gi as young Son Hyeon-gi (28)

Ma Dong-chan (32/52)

Mi-ran's mother (46/66)

Park Yoo-ja

Park Kyung-ja (24), Mi-ran's other best friend. Park Hee-jin as old Kyung-ja (44)

Kim Hong-seok (41/61)

Lee Jung-woo

Na Ha-young (44) Chae Seo-jin as young Ha-young (24), Dong-chan's girlfriend

Young Son Hyeon-gi (28)

Oh Young-seon (24), Mi-ran's best friend, who married Byung-shim. Seo Jeong-yeon as old Young-seon (44)

Old Young-seon (44)

(Ep. 1)

Adult Nam-tae (32), Mi-ran's brother

Jo Ki-beom (45), Professor Hwang's assistant Kim Wook as young Ki-beom (25)

(Ep. 6)

Old Dong-joo (50)

Doctor Yoon

Hwang Byung-shim (24), Mi-ran's ex-boyfriend Shim Hyung-tak as old Byung-shim (44)

Baek Young-tak (35), Dong-joo's ex-husband, a police detective. Lee Do-yeop as old Young-tak (55)

Old Young-tak (55)

Hwang Ji-hoon (19), Hwang Byung-shim and Young-sun's son, a freshman at Korea University who develops a crush on Mi-ran.

(Ep. 6)

Park Young-joon (19), Ji-hoon's best friend, a freshman at Korea University.

Hwang Gab-soo (46/66), the professor in charge of the frozen human experiments. He was seriously hurt in a car accident that caused him to be comatosed, rendering him unable to help Dong-chan and Mi-ran to regain consciousness for the next twenty years.