After losing his parents at age six, Haebom is taken in by his late mother's best friend, Eunseon, and lives under the same roof as her son, Taesung. The two boys grow up as close as brothers, but by the time they reach their final year of high school, they have drifted apart into a distant, awkward coexistence. That year, Haebom and Taesung are placed in the same twelfth-grade class, forcing them into perpetual proximity both at school and at home. Haebom is a quiet, timid student who regularly endures bullying from classmates, while Taesung is popular, athletic, and widely admired. As Taesung witnesses the extent of the harassment Haebom suffers, he steps in to defend him, and the protective gestures begin to thaw their estranged relationship. Slowly, they rebuild a friendship that deepens into something more complicated. Living together day and night, their interactions become charged with unspoken feelings, leading to moments of tension, tenderness, and confusion. The story follows Haebom and Taesung as they navigate the emotional and physical intimacy of their evolving bond while confronting personal insecurities, societal expectations, and the fear of jeopardizing their family-like connection. Additional narrative arcs explore Haebom's desire to become independent, the lingering weight of his parents' death, and the eventual revelation of their relationship to Eunseon, who must reconcile her role as a foster mother with her son's unexpected romance. The manhwa spans from their senior year of high school through university and beyond, depicting the gradual blossoming of love against the backdrop of everyday life, friendship, and the quiet endurance required to bridge distance and vulnerability.