Dokyeong, having failed in both work and love, returns to her hometown, Muyeong, and encounters a handsome man at her mother's store, Muyeong Super. This man is Dojun, an actor. Dojun makes a bold proposition, leading to a passionate but complicated relationship. Dokyeong, tired from ten years of unfulfilling relationships, struggles to believe in the fleeting nature of their summer romance, as Dojun tries to make it last. It's a story about a woman who wants to cherish the summer as a memory and a man who wants to make it last forever. The question hangs: "What's your favorite day of summer?" "When carols start playing."