I Am Happy

현빈

Man-Su

이보영

Su-kyeong

김성민

Hyeong-cheol

박효주

Nurse Young-sook

박노식

Bong-chul

박영서

Seung-bok

Han Eun-seon

So-yeon

Hyeong-gyu Im

Building owner

Seon-yeong Jo

Neurology department female worker

Kyeong-wu Jwa

Scoundrel

김홍파

Doctor

Kim Seong-yong

Scoundrel

Jong-hwan Oh

Officer Oh

Ju-hee Oh

Neurology department president

Seok-i Yun

Old pharmacist

In-hwa Song

Sang-suk