Perfectly identical twins, Joo Baek-hee and Joo Baek-na. And Ha-yoon, who grew up in the same household, living as their only “friend.” But beneath that relationship lies something Ha-yoon was never aware of. Unable to endure the pressure and suffocating fear, Ha-yoon eventually runs away from the house. But when he hears that his mother has collapsed, he is inevitably drawn back. The mansion remains as overwhelming and suffocating as ever—like a massive castle. And there, he inevitably comes face-to-face with Joo Baek-hee again. “Ah… the face I love so dearly, and at the same time… the face I’ve always wanted to escape from.”