Desperate Mrs. Seon-ju

Pi Seon-ju... I'll be leaving with both hands up soon. (1x42)

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Sang-ah locks Seon-ju up in the Ventilation Room. Nam-jin finds out, and he has to decide whether to save Seon-ju or not. So-woo accepts Sang-ah's suggestion on the Hansung Project. He tries to reach Seon-ju to no avail and gets worried about her. Yeon-ae visits Soon-ae's salon to make amends.