It's been ten years since Gabrielle is infected with HIV/AIDS virus when he falls into passionate love with Doo-yeol, who believes his life ended ten years ago when he was also infected by HIV/AIDS virus. The two decide to live together in a small rooftop house. But before long, they have a tiff and Doo-yeol leaves the house. The two get in touch with one another and meet again. Why is Doo-yeol leaving the rooftop house?