My Sister-in-law's Secret

My Sister-in-law's Secret (2019) is a drama directed by Choi Jae-hoo rated 6.4/10.

A sister-in-law goes to a motel with her girlfriend. She runs into her brother-in-law, who is cheating on her sister. The sister-in-law's blood boils, but there's nothing she can do about it, because now he knows she's a lesbian. They make a deal to keep each others' secrets, but the sister-in-law ends up having a threesome with her brother-in-law and her girlfriend.