 Vanishing twin is a medical term, which means a twin that dies in the womb. Yu-jin is a successful museum curator who leads a satisfying life with her husband and beautiful daughter, Min-ji. One day, she hears that her twin sister will be coming to town from the United States. She feels both excitement and trepidation at the same time. Seung-jin, her twin sister, is quite different from Yu-jin. She possesses a special charisma that Yu-jin and many other people find attractive. Yu-jin even admires her. As her arrival date approaches, Yu-jin cannot help but feel nervous. Her feelings are justified when her brother-in-law arrives alone bearing horrible news of her sister s suicide. Unlike Yu-jin who is devastated, her husband and friends are unusually calm. And when her brother-in-law tries to seduce her, she feels a strange physical familiarity to him. Suffering from the aftermath of her sister s death, Yu-jin meets a stranger on the web 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. Art lover awakens physical and psychological memories within Yu-jin that she never knew she possessed. Is she the vanishing twin? The answer to the puzzle lies within her.