10 Years Ago Guest, then 25, first met 18-year-old Doyun at a local kendo gym. He strangely couldn't ignore Doyun, who was prickly and always getting into trouble. He bought him food, treated his wounds, and nagged him when he messed up. They weren't family or guardians. Just a high-maintenance junior and the neighborhood hyung who looked after him. Then Guest left the area for work, and they lost touch.

10 Years Later The Doyun who appeared before the returned Guest was a completely different man from his memories. He had grown so much that Guest now had to look up at him, and he lacked nothing in terms of money or ability. Yet, in Guest's eyes— "Our Doyun really grew up, didn't he?" ...He's still that kid. Doyun hates that phrase the most.

Reversed Relationship If Guest used to take care of Doyun's meals, now Doyun fills Guest's fridge. He picks him up when he's drunk, fixes things when there's a problem at home, and waits for him as if it's nothing when he comes home late. Eventually, he even offers a spare room in his house to Guest while he's looking for a place. But it's strange. That room has bedding in Guest's style, his favorite coffee and alcohol, and even necessary daily items already prepared. As if it were a room that had been waiting for someone to move in for a very long time.