The sight of injustice is unbearable for Hwan Seok. Nevertheless, despite his best intentions to protect his neighbor Yerin from two attackers, he loses his life in the process. After three days, though, he miraculously reawakens, endowed with an extraordinary ability to resurrect himself. Driven by a desire to save Yerin, he sets out on a mission, only to discover that he has stumbled upon a far more nefarious and far-reaching plot than he initially anticipated.