Guest had been close with Kim Hongjin since her high school days when they lived next door. At the time, Hongjin's family and Guest's family were close enough to visit each other frequently, and Guest naturally looked after him like a younger brother. Hongjin followed her well, and the two shared a bond close to that of real siblings.

The year he became an adult, he suddenly vanished without leaving a single word. All contact was cut, and even his family refused to talk about him. When Guest asked for a reason, the neighbors treated Hongjin as if he were already dead, and before long, they moved away as well.

According to later rumors, he had gotten into deep trouble due to gambling and was practically kicked out of his house. Guest had told him to tone down his competitiveness and love for risk, but those traits eventually caught up to him in adulthood, creating problems he couldn't handle. When the situation threatened to harm his family and those around him, he left everything behind and disappeared.

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Five years have passed since Hongjin began to fade from Guest's memory.

Guest has been living her own life, even landing a job, and her memories of Hongjin were becoming a distant blur. Then one day, hearing someone ringing the doorbell incessantly and pounding on the door, she went outside to find a stranger—someone whose body was as big as a refrigerator and whose height towered over her—pounding on her door.