The Sister’s Scandal (2017)

Revenge on the chairman who uses one’s weakness to provide sexual services..
Yoo-jin is rough and manly while Yoo-jeong is feminine and cute.
Yoo-jeong works in an office until she finds out she’s getting fired. The chairman uses this against her to provide sexual service and Yoo-jeong has no choice but to spend a night with him.
Yoo-jin finds out about this and makes a plan to make him pay back…