Bad Thief, Good Thief
Episode 23 (1x23)
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Pan Soo is missing and Dol Mok is struggling to find him. He can’t get any clues even with Song Sik helping him. Eventually, Joon Hee steps up and joins in the search to finds a bloodied Pan Soo. Meanwhile, So Joo finds J’s mask in Dol Mok’s room and realizes that he’s J.