Cast from W.H.Y. : What Happened to Your relationship

Jung Gun-joo

Cha Yeon-wu

Oh Ah-yeon

Song Da-in

Yoo Dong-guk

Oh Seul-gi

Hwang In-yeop

Gi Jae-young

Lee Ji-won

Lee Han-na

Lee So-hee

Yeo Ju-hyun

Kim Young-jae

[Dain's ex-boyfriend]

Choi Hee Seung

Kim Min Woo (Ep. 2) | Guest Role

Im Hwe Jin

Kwak Jun Mo (Ep. 2) | Guest Role