Caught in a difficult situation where her stepbrother is the leader of a gang and she's being blamed for his misdeeds, Haeun's life takes a turn for the worse when she's forced to become the housemaid for an entire year just because she was late for class. With no romantic experience whatsoever, Haeun decides to get back at her stepbrother, but things don't go as planned during her first kiss, leaving her uncertain about what's to come next.