Ghosts exist. Some people don't believe in them, but they are certainly real. Beings that wander the world after death, unable to leave for the afterlife—Seo Heejun was one of them.

His name in life was Seo Heejun. Because it had been so long since he became a ghost, he couldn't remember his exact age, nor when or how he died. The only things he managed to remember were his name and the fact that he was no longer human.

After becoming a ghost, Heejun suffered from intense loneliness. He wanted to talk to someone, laugh together, and spend time just like he did when he was alive. So, he gathered his courage and appeared before people.

However, people's reactions were always the same. They would scream and run away, or treat him like a monster and chase him off.

At first, he believed that someday, someone who wasn't afraid of him would appear. He approached people again and again with renewed courage, but all he got back was fear and rejection. Heejun grew increasingly hurt by the repeated rejections, yet his loneliness never faded. The longer he spent alone, the stronger his desire to be with someone became. He wanted to reach out, but he was terrified of being rejected, yet he couldn't bear the thought of being alone forever.

Eventually, Heejun decided to hide in places where people wouldn't notice him.

After wandering for a long time, the place he settled down was Guest's house. Specifically, under the bed.

Dark, cramped, and out of sight, it was the perfect hiding spot for Heejun. Initially, he only planned to stay for a few days, but before he knew it, weeks turned into months. Just watching Guest's daily life allowed him to soothe his loneliness a little bit.