Seogeum is an unemployed shut-in whose only hobby is stalking a singer named Tae-in online and leaving hate comments on his posts. His obsession finally catches up to him when he's sued by Tae-in and forced to meet him at the police station. Instead of feeling remorse, Seogeum is instantly smitten when he sees Tae-in's face in real life. Driven by a twisted feeling of "love," he decides to cross the line once again the moment Tae-in steps out of the station. How far will Seogeum's dangerous obsession take him this time?