Toechulhaengseong Serenade

Top idol 'Kwon Jae-Sung' suddenly returns to his hometown to take a break from his prime, and there, his childhood friend 'Lee Soo-Ah', who he had separated from when he was young, is preparing to become an adult. Kwon Jae-Sung, who had a hard time parting ways, wants to impress his presence on Lee Soo-Ah again before they go their separate ways as adults.

(Source: Naver, translated)