Perfectly identical twins, Joo Baek-hee and Joo Baek-na. And Haeyun, who grew up in the same house with them since childhood—their only “friend.” But behind that relationship lay something Haeyun had never known. Unable to endure the overwhelming pressure and fear, Haeyun eventually fled the house as if running away. But upon hearing that her mother had collapsed, she had no choice but to return, as though being pulled back… The mansion still loomed like a suffocating, colossal fortress. And inside, as expected, she came face-to-face with Joo Baek-hee. “Ah… the face I love so desperately, and the face I wanted so desperately to escape.”