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Bae Suzy as Lee Chaeyoung
Shy girl but she's nice and sarcastic
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Kim Su Gyeom as Kwon ll ha
The bully and the crush Chaeyoung have on
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Shin Hyun-soo as Lee Chun Ho
The older brother of Lee Chaeyoung
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Choi Moon-hee as Lee Na Ra
The quiet best friend of Lee Chaeyoung
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Kwon Eubin as Yeon Bo-ra
The mean girl
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Im Se-mi as Ms. Park
The best teacher
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Shin Soo-hyun as Cha Soyeon
The other best friend of Lee Chaeyoung
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Woo Min-gyu as Kim Deok Joong
The funny best friend
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Kim kihae as Kim Chi Yeol aka Kimchi
The other best friend
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The rest as themselves
Lee Chaeyoung is the shy but sarcastic girl and she has her best friends Na ra, Soyeon, Deok joong, and Chi-yeol she was once friends with Kwon ll ha but ever since he became a bully they kinda drifted apart and she also has a crush on ll ha but she doesn't know how or when it happened but only her friends know that but what happened if the alien crisis happened and what would happen with Chaeyoung and ll ha?
