I Am Happy

Hyun Bin

Man-Su

Lee Bo-young

Su-kyeong

Kim Sung-min

Hyeong-cheol

Park Hyo-ju

Nurse Young-sook

Park No-shik

Bong-chul

Park Young-seo

Seung-bok

Han Eun-seon

So-yeon

Hyeong-gyu Im

Building owner

Seon-yeong Jo

Neurology department female worker

Kyeong-wu Jwa

Scoundrel

Kim Hong-pa

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

Um Tae-goo

bartender

Oh Min-ae

Doctor