Kokdu: Season of Deity

Was the Woman You Loved Seol-hui? (1x13)

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Gye-jeol and Kokdu save Han Cheol from his abduction. Gye-jeol learns about Kokdu's true nature and identity while rescuing Han Cheol, and their trust in one another starts to fade. However, Han Cheol also discovers what Kokdu is and joins forces with him to bring down Kim Pil-soo without telling Gye-jeol.