My Son-In-Law's Woman(2016)

Original title: 내 사위의 여자

Jin-sook used to hate her son-in-law Hyun-tae when her daughter died, but now Hyun-tae is like a real son to her. One day, Hyun-tae falls in love with a woman named Soo-kyung, and Jin-sook, who was unhappy with Soo-kyung, finds out that Soo-kyung is her real daughter.