Lee Si-kang

Cha Seo-joon

Lee Chae-young

Han Yoo-ra

Kang Eun-tak

Lee Tae-pung / Yoo Min-hyuk

Uhm Hyun-kyung

Han Yoo-jung

Kim Jung-don

Baek Min-won

Oh Chae-eun

Dong-ho's Kindergarten Teacher

Eru

Choi Joon-seok

Yang Mi-kyung

Lee Kyung-hye

Seo Woo-jin

Han Ho-dong / Lee Min-woo

Lee Il-hwa

Yoon Su-hee / Seo Ji-sook

Chae Bin

Kang Ye-jin

Theo Jang

Han Yoo-myeong

Kim Hee-jung

Joo Hwa Yeon [Seo Jun's mother]

Ha-min

Kim Da-in

Han Yoo-jung (young)