cast
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Sehun
Koh You
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Cho Jun-young
Koh Jun-hee
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Jang Yeo-bin
Han So-yeon
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Song Jae-rim
Dr. Koh
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Jung Yoo-jin
Han So-yeon (adult)
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Lee Seung-joon
Koh You's father
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Park Eun-hye
Koh You's mother
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Jeong Hye-seon
Koh Jun-hee's grandmother
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Jeon Young-in
An Sun-tak
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Lee Ara
Shim Jung-eun
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Baek Min-hyun
An Sun-tak (adult)
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Kwon Hyeok-beom
Jeon Sang-kyu
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Seo Beom-sik
Teacher
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Myung Jae-hwan
Homeroom Teacher
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Kim Kyung-nam
Man at the Park
