Avengers Social Club

Yoo In-soo

Kyung-bok (Seo-yun's friend

Yoo In-soo

Saebit high school student)

Byung Mo Choi

Lee Byeong-soo

Choi Kyu-Jin

Kim Hee-Soo

Yong Jang

Lee Jae-gook

Ra Mi-ran

Hong Do-hee

Yo-won Lee

Kim Jeong-hye

Se-bin Myeong

Lee Mi-sook

Lee Joon-young

Lee Soo-gyeom

Shin Dong-mi

Han Soo-ji (mother)

Byoung-Sook Sung

Mi-sook's mother-in-law

Jung Suk-yong

Baek Yeong-pyo (Mi-sook's husband)

Bo-ra Kim

Baek Seo-yeon

Sa-Kwon Kim

Park Seung-woo

Dong-woo Shin

Hwang Jung-Wook

Ae-Yeon Jeong

Kim Jeong-yoon

Jin-Sol Yoon

Kim Hee-kyung

Jung Young-joo

Joo Gil-Yeon