At his eighteenth birthday party, the life of wealthy young master Sterling is suddenly turned upside down — his parents confess that he was the child switched at birth in the hospital, and the real young master, Knox, officially returns. In a breakdown, he slams the door and leaves home. At this very moment, his a-year-long online boyfriend, DawnBreaker, mysteriously goes missing.
When college starts, Sterling is shocked to find that Knox has become his roommate. Knox appears cold and taciturn, yet quietly takes care of him: queuing for his favorite meals, secretly washing his personal clothes, and holding him during thunderstorms as he shivers from childhood trauma. Sterling resents this "true young master" who has taken over his life, yet he can't help but be moved by the subtle acts of kindness, attributing everything to parental compensation.
He reconciles with his online boyfriend, but countless coincidences gradually raise his suspicion. Eventually, the truth is dramatically revealed: Knox is DawnBreaker. At the birthday party, he recognized Sterling's couple watch, but was too timid to admit it and pretended to disappear; all the intentional sharing of a bed and thoughtful gestures were a long-planned pursuit; he even persuaded his parents to move Sterling's household registration to break the nominal family ties and be with him.
On his nineteenth birthday night, Knox proposes publicly with all his assets to reconcile. The misaligned lives are finally fulfilled thr
