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Casts
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Lee Byung-hun
as Yu-baek / Duk-gi
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Jeon Do-yeon
as Sul-rang / Wol-so
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Kim Go-eun
as Hong-yi / Sul-hee
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Lee Jun-ho
as Yull
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Lee Kyung-young
as Teacher
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Kim Tae-woo
as Jon-bok
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Kim Su-an
as Gu-seul
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Kim Young-min
as King
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Seong Yu-bin
as Gam-cho
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Bae Soo-bin
as Poong-chun