Pemeran Friendly Rivalry

Lee Hye Ri (이혜리)

as Yoo Je I

Pemeran Utama

Chung Su Bin

as Woo Seul Gi

Pemeran Utama

Kang Hye Won

as Ju Ye Ri

Pemeran Utama

Oh Woo Ri

as Choi Gyeong

Pemeran Utama

Choi Young Jae

as Nam Byeong Jin

Pemeran Pembantu

Kim Tae Hoon

as Yoo Tae Jun [Je I's father]

Pemeran Pembantu

Chae Seo Eun

as Cho A Ra

Pemeran Pembantu

Kim Sang Ji

as Kim Beom Su

Pemeran Pembantu

Kang Jin Ah

as Kwon Hui Yun

Pemeran Pembantu

Ma Hyun Ji

as Park Byeong Hui

Pemeran Pembantu

Choo Ye Jin

as Yoo Je Na

Pemeran Pembantu

Ha Min

as [Principal]

Pemeran Pembantu

Lah Hyun Jin

as Koo Chae Ryeong

Pemeran Pembantu

Koh Da Hyeon

as Kim Na Ri

Pemeran Pembantu

Han Ri I

as Lee Si U

Pemeran Pembantu

Kim Yu Bin

as Bae Yeon Seo

Pemeran Pembantu

Yoo Ha Young

as Choi Su Jin

Pemeran Pembantu

Lee Eun Ju

as [Nun] (Ep. 1)

Bintang Tamu

Son Young Soon

as [Flower seller] (Ep. 1)

Bintang Tamu

Park Seong Kyun

as [Security guard] (Ep. 1)

Bintang Tamu

Oh Eun Seo

as Yoo Je I [Young] (Ep. 3)

Bintang Tamu

Park Soo Jin

as [Coach] (Ep. 3)

Bintang Tamu

Gi So Yoo

as Yoo Je Na [Young] (Ep. 3, 9)

Bintang Tamu

Lee Jae Joon

as Jung Ha Jin (Ep. 5)

Bintang Tamu

Seo Yeon Woo

as Im Hyeon Ji (Ep. 5)

Bintang Tamu

Song A Kyung

as [Music professor] (Ep. 5)

Bintang Tamu

Jung Il Hwa

as [Choi Gyeong's teacher] (Ep. 5)

Bintang Tamu

Moon Ki Young

as [Doctor] (Ep. 6)

Bintang Tamu

Jun Joon Woo

as [Psychiatrist] (Ep. 6)

Bintang Tamu

Yoon Chae Na

as Ju Ye Ri [Young] (Ep. 7)

Bintang Tamu

Jo Eun Joo

as [Host club worker] (Ep. 7)

Bintang Tamu

Lee Seol A

as Yoo Je Na [Teen] (Ep. 9)

Bintang Tamu

Min Sang Chul

as [Lawyer] (Ep. 10)

Bintang Tamu

Kim Won Seok

as [Detective] (Ep. 10)

Bintang Tamu

Choi Ri Ho

as [Beom Su's father] (Ep. 10)

Bintang Tamu

Choi Ga In

as [Beom Su's mother] (Ep. 10)

Bintang Tamu

Lee Woo Joo

as Yoo Tae Jun [Teen] (Ep. 11)

Bintang Tamu

Im Jun Hyeong

as [Nightclub bouncer] (Ep. 11)

Bintang Tamu

Jung Yong Hee

as [Nursing home doctor] (Ep. 12)

Bintang Tamu

Kim Hak Soo

as [Security staff] (Ep. 13)

Bintang Tamu

Kwon Hyuk Soo

as [Tae Jun's father] (Ep. 13)

Bintang Tamu

Park Geon Rak

as [Tae Jun's brother] (Ep. 13)

Bintang Tamu

Yoon Woo Ri

as [Woman buying drugs] (Ep. 13)

Bintang Tamu

Park Sang Hwi

as [Lawyer] (Ep. 14)

Bintang Tamu

Hong Dae Sung

as [Mechanic] (Ep. 14)

Bintang Tamu

Song Chae Yun

as Song Jae Hui (Ep. 16)

Bintang Tamu

Lee Dong Gyu (이동규)

as [Anchor] (Ep. 16)

Bintang Tamu

Kim Geu Lim

as Son Mi Yeong

Bintang Tamu

Bae Hyun Kyung

as Park Min Gyu

Bintang Tamu

Lee Won Jae

as Woo Do Hyeok

Bintang Tamu

Lee Joo Yeon

as Yoo Je I [Young teen]

Bintang Tamu

Joo Ye Rim

as Choi Gyeong [Young]

Bintang Tamu

Park Min Young

as [Je I's mother]

Bintang Tamu

Lee Na Ra

as [Ye Ri's mother]

Bintang Tamu

Seo Hye Jin

as [Bubble manager]

Bintang Tamu

Bae Yoon

as Bartender (Ep. 11)

Bintang Tamu

Go Seo Hee

as Nam Ji Yeon

Bintang Tamu

Park Gi Seon

as [Judge] (Ep. 14)

Bintang Tamu

Kim Tae Geun

as Park Myeong Ho (Ep. 15-16)

Bintang Tamu

Lim Su Hwan

as [Chief of administration]

Bintang Tamu

Moon Seo Hyeon

as Woo Seul Gi [Teen]

Bintang Tamu

Choi Ha Yoon

as Woo Seul Gi [Child]

Bintang Tamu

Kim Bom

as [Middle school bully] (Ep. 1)

Bintang Tamu

Hong Hyun Ho

as [Hostel manager] (Ep. 12)

Bintang Tamu

Lee Eo Jin

as Kim Mi Yeon (Ep. 2)

Bintang Tamu

Choi Yeon Hwa

as [Institute teacher] (Ep. 2)

Bintang Tamu

Song Chae Yun

Original Creator

Min Ye Ji

Screenwriter

Kim Tae Hui

Screenwriter & Sutradara