In a world where the ties of family seem unbreakable, Y/N, BTS's young sister, finds herself lost in a world of resentment and lies. Despite being part of the family, the members of BTS despise her, harboring a deep-seated hatred toward her. The reason? They believe she is responsible for their mother's death, even though Y/N has no idea what truly happened. Forced to live under the same roof due to their father's cruel hand, Y/N's life becomes a constant battle for acceptance. In contrast, their stepsister, loved by all, enjoys the affection that Y/N can only dream of. Unbeknownst to her, dark secrets from the past bind the family together, secrets that could destroy everything once they are exposed. Will Y/N uncover the truth before it's too late? Or will she remain trapped in a web of lies and betrayal?