Romance Is a Bonus Book

Lee Na-young

Kang Dan Yi

Lee Jong-Suk

Cha Eun-ho

Jeong Eu-Gene

Song Hae Rin

Wi Ha-joon

Ji Seo-joon

Kim Sun-young

Seo Yeong-ah

Jo Han-chul

Bong Ji-hong

Ji-won Lee

Hong Jae-hee

Kim Tae-Woo

CEO Kim Jae Min

Kim Yu-Mi

Go Yoo-seon

Jong-goo Lee

Byung Jun doctor

Park Gyuyoung

Oh Ji Yul

Kang Ki-Doong

Park Hoon

Choi Eun-kyung

Oh Ji-yool's mother

Kim Ji-Hyeon

Interviewer

Jung Hyun Noh

Ji-yool's boyfriend

Hwang Se-won

Kim Na-kyung (Eun-ho's ex-girlfriend)

Kang-Hoon Kim

Cha Eun-ho (young)

In-jo Yoo

Yoo-seon's friend