The Sisters 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...