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Y/N, Jungkook’s sister’s best friend, has loved him for years despite his possessive and volatile nature. After they finally spend the night together, Jungkook confesses his feelings and promises they will face their relationship honestly—only to betray her the next morning by denying everything, calling her obsessed, and threatening to ruin her reputation if she tells anyone. When Y/N discovers she is pregnant, she keeps the child a secret, convinced Jungkook is not someone she can trust. Months later, he learns the truth after she collapses and finds her ultrasound photograph. Desperate to become part of his child’s life, Jungkook begs for forgiveness, but Y/N reminds him that he deliberately destroyed her trust and chose to lose her. Now he must live with the consequences of betraying the woman who loved him and accepting that becoming a better man may never be enough to earn her back.