Main characters Edit
Lee Hyeri as Sung Deok-sun
The middle child of her family, she is not very bright in studies and is the only girl in their group of five neighborhood friends.
Ryu Jun-yeol as Kim Jung-hwan
Stoic and sarcastic, grumbles a lot, loves soccer and also one of the top students in school. He harbors a crush for Deok-sun.
Park Bo-gum as Choi Taek
A genius baduk player who is mostly quiet and struggles with simple day-to-day tasks. He, along with Jung-hwan, likes Deok-sun.
Go Kyung-pyo as Sun-woo
A caring brother and a dependable son to his family.
Lee Dong-hwi as Ryu Dong-ryong
The geek of the group, but more knowledgeable about girls and life in general.
Supporting characters Edit
Sung family
Sung Dong-il as Sung Dong-il (Deok-sun's father)
Lee Il-hwa as Lee Il-hwa (Deok-sun's mother)
Ryu Hye-young as Sung Bo-ra (Deok-sun's older sister)
Has a warm heart beneath her stubborn, ill-tempered exterior. Active in the student protest movement and a student at Seoul University.
Choi Sung-won as Sung No-eul (Deok-sun's younger brother)
Despite being the youngest child of the Sung family, he looks much older than his age.
Kim family
Kim Sung-kyun as Kim Sung-kyun (Jung-hwan's father)
Ra Mi-ran as Ra Mi-ran (Jung-hwan's mother)
Ahn Jae-hong as Kim Jung-bong (Jung-hwan's older brother)
Neighborhood residents
Kim Sun-young as Kim Sun-young (Sun-woo's mother)
Kim Seol as Jin-joo (Sun-woo's little sister)
Choi Moo-sung as Choi Moo-sung (Taek's father)
Yoo Jae-myung as Ryu Jae-myung (Dong-ryong's father)
Extended cast
Lee Min-ji as Jang Mi-ok (Deok-sun's friend)
Lee Se-young as Wang Ja-hyun (Deok-sun's friend)
Kim Tae-soo as Sun-young's older brother
Lee Mi-yeon as adult Sung Deok-sun
Kim Joo-hyuk as Husband of adult Sung Deok-sun[8]
Jeon Mi-seon as adult Sung Bo-ra
Woo Hyun as adult Sung No-eul
Cameo and guest appearances Edit
Kim Young-ok as Deok-sun's grandmother (ep. 2)
Jung Won-joong as Dong-il's older brother (ep. 2)
Kim Su-ro as snack shop owner (ep. 3)
Lee Moon-se (voice) as radio DJ (ep. 6)
Park Ji-yoon as TV interviewer (ep. 7)
Park Jung-min as Bo-ra's boyfriend (ep. 8)
Kim Tae-hoon as Cardiac surgeon (ep. 8)
Lee Soo-kyung as No-eul's girlfriend (ep. 8)
Jung Yoo-min as Bo-ra's friend (ep. 8)
Jung Hae-in as Ho-young, Deok-sun's middle school friend (ep. 13)
Shin Young-jin as Class President's mother (ep.14)
Jung-woo as Kim Jae-joon/Trash (ep.18)
Main characters EditLee Hyeri as Sung Deok-sunThe middle child of her family, she is not very bright in studies and is the only girl in their group of five neighborhood friends.Ryu Jun-yeol as Kim Jung-hwanStoic and sarcastic, grumbles a lot, loves soccer and also one of the top students in school. He harbors a crush for Deok-sun.Park Bo-gum as Choi TaekA genius baduk player who is mostly quiet and struggles with simple day-to-day tasks. He, along with Jung-hwan, likes Deok-sun.Go Kyung-pyo as Sun-wooA caring brother and a dependable son to his family.Lee Dong-hwi as Ryu Dong-ryongThe geek of the group, but more knowledgeable about girls and life in general.Supporting characters EditSung familySung Dong-il as Sung Dong-il (Deok-sun's father)Lee Il-hwa as Lee Il-hwa (Deok-sun's mother)Ryu Hye-young as Sung Bo-ra (Deok-sun's older sister)Has a warm heart beneath her stubborn, ill-tempered exterior. Active in the student protest movement and a student at Seoul University.Choi Sung-won as Sung No-eul (Deok-sun's younger brother)Despite being the youngest child of the Sung family, he looks much older than his age.Kim familyKim Sung-kyun as Kim Sung-kyun (Jung-hwan's father)Ra Mi-ran as Ra Mi-ran (Jung-hwan's mother)Ahn Jae-hong as Kim Jung-bong (Jung-hwan's older brother)Neighborhood residentsKim Sun-young as Kim Sun-young (Sun-woo's mother)Kim Seol as Jin-joo (Sun-woo's little sister)Choi Moo-sung as Choi Moo-sung (Taek's father)
Yoo Jae-myung as Ryu Jae-myung (Dong-ryong's father)
Extended cast
Lee Min-ji as Jang Mi-ok (Deok-sun's friend)
Lee Se-young as Wang Ja-hyun (Deok-sun's friend)
Kim Tae-soo as Sun-young's older brother
Lee Mi-yeon as adult Sung Deok-sun
Kim Joo-hyuk as Husband of adult Sung Deok-sun[8]
Jeon Mi-seon as adult Sung Bo-ra
Woo Hyun as adult Sung No-eul
Cameo and guest appearances Edit
Kim Young-ok as Deok-sun's grandmother (ep. 2)
Jung Won-joong as Dong-il's older brother (ep. 2)
Kim Su-ro as snack shop owner (ep. 3)
Lee Moon-se (voice) as radio DJ (ep. 6)
Park Ji-yoon as TV interviewer (ep. 7)
Park Jung-min as Bo-ra's boyfriend (ep. 8)
Kim Tae-hoon as Cardiac surgeon (ep. 8)
Lee Soo-kyung as No-eul's girlfriend (ep. 8)
Jung Yoo-min as Bo-ra's friend (ep. 8)
Jung Hae-in as Ho-young, Deok-sun's middle school friend (ep. 13)
Shin Young-jin as Class President's mother (ep.14)
Jung-woo as Kim Jae-joon/Trash (ep.18)
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