After losing their parents, Jeon Jungkook takes on the burden of raising his younger sister, Ara, and their adopted brother, Kim Taehyung. To support the family, Jungkook works tirelessly, taking on dangerous illegal jobs in addition to his day job. Despite his sacrifices, he keeps his emotions and struggles hidden, focusing solely on ensuring a better future for his siblings.
Taehyung, an aspiring artist, deeply admires Jungkook's unwavering dedication but feels helpless watching him suffer. Over time, his admiration transforms into romantic feelings, which he can no longer suppress. When Taehyung confesses his love and kisses Jungkook, the bond they've shared is shaken. Overwhelmed, Jungkook sends Taehyung abroad, hoping distance will help them return to normal.
However, Taehyung returns as a confident man determined to claim the love he feels is mutual, despite Jungkook's denial. Jungkook struggles to reconcile his role as a brother with his growing feelings for Taehyung.
Their journey is one of love, sacrifice, and self-discovery as they navigate societal judgment, personal fears, and their undeniable connection. In the end, they must decide whether to remain as brothers or cross the line into love.