I Am Happy

Hyun Bin

as

Man-Su

Lee Bo-young

as

Su-kyeong

Kim Sung-min

as

Hyeong-cheol

Park Hyo-ju

as

Nurse Young-so...

Park No-shik

as

Bong-chul

Park Young-seo

as

Seung-bok

Han Eun-seon

as

So-yeon

Hyeong-gyu Im

as

Building owner

Seon-yeong Jo

as

Neurology depa...

Kyeong-wu Jwa

as

Scoundrel

Kim Hong-pa

as

Doctor

Kim Seong-yong

as

Scoundrel

Jong-hwan Oh

as

Officer Oh

Ju-hee Oh

as

Neurology depa...

Seok-i Yun

as

Old pharmacist

In-hwa Song

as

Sang-suk

Um Tae-goo

as

bartender