Three girls of the same family are family friends. They have similar personalities. They help each other and are each other's best friends. They have left happy and unforgettable memories in childhood and vowed never to betray each other. However, their relationship does not seem to become more and more mellow like fine wine with the tempering of time, but because of a small change. Their relationship for several years easily broke down. The three girls walked blankly into the trap of a mysterious man. Although they were all in front of each other, they could not break through the barrier in front of them. Because of a trivial matter, a misunderstanding turned into a dispute. The more the quarrel became, the more serious it was and it was easy to break up. Will the previous vows be drowned in hatred and disputes like this? Can't good memories continue it? I cried, big tears falling on the ground, helplessness, entanglement and heartache welling up together. Friendship is beautiful throughout life, but for these three lovely girls, it is like an extremely sharp knife, piercing their hearts deeply. Some time before the cardiac arrest, the girls missed each other, were helpless and afraid, and could only hide it in their hearts and could not let their partners worry. The deep helplessness could not be released, and they could only vent their anger through crying. Friendship is so fragile. When they are about to die, the girls can no longer hold on. Although the girls feel very sad, they still put their brightest smiles on their delicate faces. The three girls forgive each other, but it is too late. Suddenly, earth-shaking changes occur, time begins to go backwards, everything is the same as before, but can they still find each other and regain their friendship? Will that mysterious man give up again?