Identical twins Joo Baek-hee and Joo Baek-naa share everything, including their obsession with one person: Jung Hae-yoon, a seemingly ordinary friend caught between them. To one, Hae-yoon is a precious toy; to the other, an irreplaceable treasure. As the twins’ twisted desires begin to blur the line between love and possession, can Hae-yoon escape from their beautiful but dangerous grasp?