On the surface, Yoonbum and Sangwoo were nothing more than strangers attending the same college. Sangwoo was difficult to read. Quiet yet approachable when he chose to be, he carried himself with an effortless charm that drew people in without trying. He kept his private life carefully sealed behind an easy smile, allowing others to believe they knew him while revealing almost nothing of himself. To most, he was simply another student with a pleasant face and an ordinary routine. Yoonbum was the complete opposite. Timid, withdrawn, and almost invisible among the crowds, he spent most of his days fading into the background. Speaking to others rarely came naturally, but watching them did. Especially Sangwoo. What began as a harmless crush gradually twisted into an all-consuming obsession. Every chance encounter became precious. Every piece of information about Sangwoo's life was treasured, collected, and memorized. The distance between admiration and intrusion slowly disappeared until Yoonbum no longer recognized where one ended and the other began. To Yoonbum, the feelings were love. To everyone else, they would have looked frightening. Neither of them realized that the fragile thread connecting their lives had already begun tightening around them. One chased an impossible fantasy, while the other continued living behind a carefully maintained mask—unaware that someone had quietly stepped into every corner of his life. Soon enough, both of them would discover that some obsessions don't simply fade away. They consume everything.