Yeoseongjeonyonghelseujang Jindallaejim

Even though Gye-nari isn't too rich, she moved to a pretty good penthouse. However, it turned out that the room was connected to a women-only gym downstairs through a secret staircase. Jin Dal-rae, the gym director and landlord, has spent all of his rent due to remodeling. While collecting the deposit money to return, she offers Gye Na-ri free personal training for 3 months.

(Source: Naver, translated and edited)