Vanishing Twin (2000)

In Vanishing Twin (2000), Yu-jin (Su-won Ji) is excited to learn that her twin sister, Seung-jin, will be visiting from the U.S. She is shocked and disappointed, however, when her sister’s husband appears instead, bearing news of Seung-jin’s death by suicide. Things get strange when her brother-in-law puts the moves on Yu-jin (she gets topless in three steamy scenes) and a mysterious stranger on the internet claims to hold the key to her sister’s bizarre death. Director Yun Tae-yong supervised this erotic Korean mystery.