معادلة الحب

Yoo Yeon-Seok

Ha Sang-soo

Moon Ga-young

Ahn Soo-young

Sae-Rok Keum

Park Mi-kyung

Ga-ram Jung

Jung Jong-hyun

Seo Jung-yeon

[Sang Soo's mother]

Park Mi-hyeon

Sim Kyeong-sook (Soo-yeong's mother)

Tae-yu Moon

So Kyung Pil

Yoon Yoo-sun

Mi-kyung's mother

Dong-min Oh

Yang Seok-hyun

Jo In

Bae Eun Jung

Jae-Sung Jung

Yook Si-kyung

Jo-a Yang

Seo Min-hui

Oh So-Hyun

Kim Ji-yoon

Park Yoon-hee

[Soo Young's father]

Hwa-ryong Lee

Noh Tae-pyeong

Lee Si-hoon

Ma Du Sik

Hyung-Soo Park

Lee Goo Il