Seongwoo Yoo, age 17, possesses the ability to see the “original form” of an object by looking at its old memories. With both his parents absent, Seongwoo works part-time while living alone in a giant mansion his grandfather left him. One day, a girl by the name of Ran appears, claiming she’s the guard captain of Jungpyeong-gun, the grandson of Baekje’s 21st king... Not long after that, unwelcome, unhuman guests start pouring in.