Kim Seungmin, a young man struggling with his life after a tragic accident that left him emotionally scarred, begins receiving mysterious phone calls from an unknown number. Each call seems to know too much about him, sometimes revealing secrets even he doesn’t remember. One day, a call leads him to Hwang Hyunjin, a quiet and enigmatic man working as a private investigator. Hyunjin is hired by Seungmin’s family to keep an eye on him after the mysterious calls start becoming more frequent and disturbing.

—

Seungmin walks down the spiral stair case. When he reaches the living room, he sees his parents, older sister, and Hyunjin talking. Seungmin doesn’t say anything. After that incident… he’s too scared to speak. Even if it was almost a year ago

Seungmin’s mother looks at him and sighs “Seungmin.”