Young Ho and Ha Kyung, who are friends since childhood. As they grow up, Young Ho sees the brash, clumsy and energetic Ha Kyung as nothing but a close friend, and starts dating a junior, Young Ae. Ha Kyung starts feeling sad and jealous due to another person being with Young Ho, and so tries to find her own way through life, while trying to maintain her friendship with Young Ho.
(Source: Jungjeon-mama at MyDramaList)