Vanishing Twin (2000)

Yu-jin hears that her twin sister Seung-jin will be coming to town from the US. In the end only her brother-in-law arrives bearing horrible news of her sister's suicide. When her brother-in-law tries to seduce her, she feels a strange physical familiarity to him. Yu-jin meets a stranger online who calls himself art lover. He alludes to the suspicious circumstances surrounding Seung-jin's death and Yu-jin finds herself discovering her sister's past.