In a cynical world where love has lost its luster, 37-year-old Hayeong Kim is merely a shell of her former self. But in a twist of fate, she’s catapulted back in time, inhabiting the body and vibrant spirit of her 17-year-old self, Seon Kim, and reliving an era of passionate love and limitless potential. Empowered by her knowledge of what’s to come, Seon embarks on a mission to reshape her friends’ destinies. Bouncing between past and present, orchestrating grand changes, Seon begins to discover that altering others’ lives might be the key to rediscovering love, purpose, and the courage to dream again.