To Her (2017)
Original title: 사촌여동생
To Her is a 2017 Korean-language drama movie directed by Yang Ho-yeol, with a running time of 1h 30m. It stars Yoo Ji-won, Ahn So-hee and Kim Jong-sin.
Gwang-ho is bored except for the time he's taking off his girlfriend's underwear. He visits his Seoul home at the news that his grandfather is dying. Amidst the awkwardness, he remembers something. Ji-yoon is his cousin who has grown up to be a young lady. Gwang-ho is attracted to the fully grown woman and the same is said for Ji-yoon.