Forbidden Love is a story centered around Lisa, a girl with black hair and hazel eyes, and her handsome, gentle, and genius older brother, Believe. The central conflict arises from Lisa's secret, romantic love for her brother, a feeling she knows is wrong but cannot suppress. The narrative shifts between Lisa's perspective, which is filled with heartbreak and jealousy over Believe's's actions, and Believe's perspective, revealing his own secret feelings for Lisa and his struggle to suppress them. The plot intensifies as Believe tries to push Lisa away by pretending to date a girl named Jane, which leads to Lisa’s emotional distress and impulsive actions. The story explores the pain and confusion of their forbidden feelings and the destructive consequences of their attempts to deny them.