Lost ones are sometimes found back again. Like the bond they shared was found back through the decade of their yearning but could a lost love be found again? Without the interruption of their wrong timing again? Join their tale of unforgettable us.         

Senior, Ahn Mina is secretly afraid of water but manages her high school’s swim team. She loves watching others swim but cannot bring herself to be in water herself from a past traumatic experience. It’s her last year being the swim team’s manager, but somehow the best swimmer on the team figures out her secret.