비밀의 남자

이시강

Cha Seo-joon

이채영

Han Yoo-ra

Kang Eun-tak

Lee Tae-pung / Yoo Min-hyuk

엄현경

Han Yoo-jung

Kim Jung-don

Baek Min-won

Oh Chae-eun

Dong-ho's Kindergarten Teacher

Eru

Choi Joon-seok

양미경

Lee Kyung-hye

서우진

Han Ho-dong / Lee Min-woo

Lee Il-hwa

Yoon Su-hee / Seo Ji-sook

Chae Bin

Kang Ye-jin

장태오

Han Yoo-myeong

Kim Hee-jung

Joo Hwa Yeon [Seo Jun's mother]

Ha-min

Kim Da-in

Han Yoo-jung (young)