Yoon Gi-jun, who became the son-in-law of a large company's chairman, visits Mujin, where he once recovered from a lung illness in the past, to take a vacation. In Mujin, Gi-jun meets In-sook, who majored in vocal music. Eventually, he discovers himself drawn to Ha In-sook, which reminds him of his past in Mujin, symbolized by the fog. The two confirm their feelings for each other and become one. In-sook asks Gi-jun to take her to Seoul. However, Gi-jun leaves her behind and departs for Seoul.