Ha Na' and her friends are now in the third grade. The only time they can gather is lunchtime, but they still manage to enjoy their school life diligently. One day, there came a transfer student in Ha na's class. This transfer student brings a strange wave to friendship and the love relationship....

Two female high schoolers, Do Ha Na, and Kim Ha Na have same name, but different look and personality. The two "Ha Na" became friends by Boram in the same class. One day, there is a post on school social media by anonymity. "I like you, Ha Na in the third class of the second grade at SeoYeon High school." Both Kim Hana and Do Hana became the gossip of the school, and they all wonder about which HaNa is the one mentioned....