Cha Gang-Jin, haunted by a tragic past, falls for Han Ji-Wan during their teenage years. When a mishap with a pendant causes her brother's drowning, Ji-Wan leaves town, telling Gang-Jin she never loved him. Eight years later, Gang-Jin––now a successful team leader––reunites with Ji-Wan at her engagement party to his colleague, Min Tae-Jun. When Tae-Jun fails to show up, Ji-Wan and Gang-Jin’s unresolved feelings resurface, forcing them to confront their past. As the two reconnect, they are forced to confront the unresolved pain from their past and the complex web of love, guilt, and betrayal. Will they find a way back to each other, or will the scars from their past keep them apart forever?