Falling head-over-heels in love with Eun-seo, Sang-jin decides to learn classic guitar to impress her. His next step is to join the literary class that she is a member of. He even plunged into studying and gains admission to one of the top universities in Seoul. All his efforts were made for one sole reason, to impress Eun-seo. Yet, her words were "I'm sorry." After being turned down by Eun-seo, he realizes that he may have more than friendly feelings for his good friend, Hyeon-ju…..