Adapted from the comic of the same name. Yoon Woo Hyun has a crush on his homeroom teacher. He originally planned not to open up to anyone until he graduated from high school, but his good friend Park Do Ha discovered this fact and Park Do Ha's attitude towards him changed a little. He thought that it was because he liked men and hated him, so he planned to open up to him, but unexpectedly, Park Do Ha confessed, "Actually... I like you." Yoon Woo Hyun finally gave up his love for the homeroom teacher and agreed to date Do Ha, but the condition was that they would only date until they graduated from high school...