Lately, Sunghoon had been feeling as though someone was watching him. Whether he was at school, in a café, at the mall, or even at home, he constantly felt uneasy. It was as if a pair of eyes followed his every move, no matter where or when.

Disturbed by the feeling, he decided to install CCTV cameras throughout his house, just in case something unusual happened. A week had passed since the cameras were installed, yet he had found nothing.

"Strange," he muttered, furrowing his brows. "I'm sure someone's been stalking and watching me, even at home, but there's nothing here."

At that moment, he was in his room, reviewing the CCTV footage from the morning before he left for school to the evening when he returned. Unbeknownst to him, someone was watching him from outside his window.