Triangle

Kim Jae-joong

as

Heo Young-dal ...

Yim Si-wan

as

Yoon Yang-ha /...

Lee Beom-soo

as

Jang Dong-soo

Oh Yeon-soo

as

Hwang Shin-hye

Baek Jin-hee

as

Oh Jung-hee

Park Ji-yeon

as

Sung Yoo-jin

Kim Byeong-ok

as

Ko Bok-tae

Kim Hye-eun

as

Kim Ok-kyung

Mun Jung Hyun

as

Min Su

Hong Seok-cheon

as

Man-kang

Kim Ji-young

as

Oh Jung-hee's ...

Park Hyo-ju

as

Kang Jin

Jung Ji-yoon

as

Kang Hyun-mi

Noh Young-hak

as

Jang Dong-soo ...

Kim So-hyun

as

Hwang Shin-hye...

Kim Byeong-gi

as

Yoon Tae-jun

Oh Soon-tae

as

Wan Bae