Lim Ju-kyung (16 Episodes)

Lee Su-ho (16 Episodes)

Han Seo-jun (16 Episodes)

Kang Soo-jin (16 Episodes)

Lim Hee-kyung (16 Episodes)

Lim Jae-pil (16 Episodes)

Hong Hyun-suk (16 Episodes)

Han Joon-woo (16 Episodes)

Lim Ju-young (16 Episodes)

Choi Soo-a (16 Episodes)

Kim Cho-rong (16 Episodes)

Young Im Hee-kyung (16 Episodes)

Park Sae-mi (16 Episodes)

Han Go-woon (16 Episodes)

Yoo Tae-hoon (16 Episodes)

Choi Man-shik (16 Episodes)

Ahn Hyun-gyu (16 Episodes)

Kim Si-hyun (16 Episodes)

Ha Ji-young (16 Episodes)

Lee Joo-hun (16 Episodes)

Mr. Oh (16 Episodes)

Se-mi's Friend (16 Episodes)

Kim Ga-young (16 Episodes)

Joo Hye-min (16 Episodes)

Comic Store Owner (16 Episodes)

Lee Ye-rim (16 Episodes)

Disciplinary Teacher (16 Episodes)

Vice-principal (16 Episodes)

Selena Lee (16 Episodes)

Yoo Gang-hyeon (16 Episodes)

Classmate (16 Episodes)

Woo-hyeon's Girlfriend (16 Episodes)

Jeong Se Yeon [Su Ho & Seo Jun's friend] (5 Episodes)

Lee Sung Yong [Yongpa High student] (5 Episodes)

Lee Mi Hyang [Seo Jun’s mother] (5 Episodes)

Byeon Joon Hyeok [Yongpa High student] (4 Episodes)

Lim Joo Gyung [Young] (4 Episodes)

Lee Su Ho [Young] (4 Episodes)

Doctor Kang [Soo Jin's father] (4 Episodes)

[Soo Jin's mother] (4 Episodes)

[Saebom High student bully] (4 Episodes)

[Math teacher] (3 Episodes)

[Neighborhood woman] (2 Episodes)

[History teacher] (2 Episodes)

Jin Hee Jung [Seobom High freshman student (1 Episodes)

[Music teacher] (2 Episodes)

[Move Entertainment team leader] (2 Episodes)

[Photographer] (2 Episodes)

[Columbus Park] (2 Episodes)

[Hee Kyung's acquaintance] (2 Episodes)

[Joo Hun's assistant] (2 Episodes)

Chen [Move Entertainment celebrity] (2 Episodes)

[Seo Jun's band member] (2 Episodes)

Lim Hee Gyung [Young] (1 Episodes)

Lim Joo Young [Young] (1 Episodes)

[Neighborhood woman] (1 Episodes)

[Yongpa High student] (1 Episodes)

[Yongpa High student] (1 Episodes)

Wang Hyun Bin [Joo Gyung's crush] (1 Episodes)

(1 Episodes)

[Su Ho's housekeeper] (1 Episodes)

[Comic store customer] (1 Episodes)

[Convenience store friend #1] (1 Episodes)

[Convenience store friend #2] (1 Episodes)

[Convenience store friend #3] (1 Episodes)

Eun Dan Oh [Movie goer] (1 Episodes)

Baek Kyung [Movie goer] (1 Episodes)

Ryu Hyung Jin [Baseball player] (1 Episodes)

[Sung Yong's father] (1 Episodes)

[Baseball game spectator] (1 Episodes)

[Swarovski saleswoman] (1 Episodes)

[Camp ground owner] (1 Episodes)

[Angry customer] (1 Episodes)

[Community center grandmother] (1 Episodes)

[Soo Jin's math tutor] (1 Episodes)

[Gangster] (1 Episodes)

[Bus driver] (1 Episodes)

[Move Entertainment employee] (1 Episodes)

Min Jae Joon [Plastic surgeon] (1 Episodes)

[Wedding shop staff] (1 Episodes)

Oh Nam Joo [Man at Namsan Tower] (1 Episodes)

Dr. Han Chae Hoon [Emergency room doctor] (1 Episodes)

[Doctor] (1 Episodes)

[Community center grandmother] (1 Episodes)

[Female student] (1 Episodes)

[Student] (1 Episodes)

[Reporter] (1 Episodes)

[Cinema viewer] (1 Episodes)

Ji Woo Hyeon (1 Episodes)

[English teacher] (1 Episodes)

[Kindergarten boy] (1 Episodes)

[Playground bully] (1 Episodes)