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Jealousy is My Power (1x6)

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Jun Ki is given the chance to star in a movie as a stand-in for a bed scene. First, he is hesitant, but when he hears that the female actress is Shin Soo Jung, he agrees to do it. However, he is required to lose 10kg. Meanwhile, Yoon Ah befriends a man during class. Turns out, the man is a pervert, but no one except Dong Gu can see this. Dong Gu is beyond frustrated.