Title for Members Only

Directed by Kim Daniel (김다니엘)

80min | Release date in South Korea: 2018/09/21

(Uncut) 92min | Release date in South Korea: 2018/11/16
Condensed version: One Night With My Younger Sister (여동생과의 하룻밤)
45 min | Release date in South Korea: 2024/09/06

Synopsis
My ex-girlfriend became my stepsister, but my desire for her love keeps growing. Just for today, treat me like your girlfriend again, not your younger sister.

Jeong-geun, who was dating his first love from high school, Seon-hye, had to break up with her because of his military enlistment and her studies abroad. He then starts dating So-jin, who likes him, but he still has lingering feelings for his first love. One day, Jeong-geun's father suddenly announces his remarriage, and during the family meeting with his new stepmother, he is shocked to discover that her daughter is none other than his ex-girlfriend. Both Jeong-geun and Seon-hye are taken aback and both thrown into turmoil, but they can't interfere with their parents' happiness because of their past, so the two families continue to merge, and the former lovers end up living under the same roof now as stepsiblings. At first, their relationship becomes awkward, and to encourage them to get along better, their parents give them some time alone. However, Jeong-geun and Seon-hye soon realize that their feelings for each other haven't completely faded, and they eventually spend a hot night together, becoming increasingly bold in their actions.

In the past, they were lovers. Now they are siblings. What choice will Jeong-geun and Seon-hye make?