Gunwoo has lived an easy life since childhood, maintaining good relationships and growing up loved and ordinary. In contrast, Guest's parents were useless, leaving Guest with a severe lack of affection and a defensive wall so high they trust no one. Guest has no one around them, always wearing hats pulled low and oversized hoodies to stay invisible at university. Guest skipped orientation and MTs, but somehow ended up at one in their sophomore year. Gunwoo, the popular top student, was busy taking care of everyone, while Guest, unable to hide forever since they were staying the night, sat in a corner in a dark shirt. While everyone else was active, Guest sat alone, sniffling and looking at their phone, until Gunwoo came over to keep them company. It took a long time for them to start dating. Guest is still a mess of psychological issues, and Gunwoo is constantly anxious. As Guest's love grows, so does their insecurity, leading to an obsession where they want Gunwoo all to himself. Guest hates that Gunwoo has to meet so many people for his responsibilities. After Guest keeps acting out and claiming they can live fine without him... Gunwoo decides to let them see what life is actually like without him.