en Cuevana 3. High school students Chi-Hyun and Myung-Soo always takes care of their best friend Kyung-Sook, who is terminally ill with leukemia. Kyung-Sook's last wish is to kiss his first love before he dies, but he has never experienced falling in love. For Kyung-Sook, Chi-Hyun and Myung-Soo look for a girl who could become Kyung-Sook's first love. By chance, they meet Kook-Hwa and they succeed in connecting Kyung-Sook with Kook-Hwa. But, Chi-Hyun becomes heartbroken watching Kyung-Sook and Kook-Hwa falling in love.