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Girls' friendship and vows, jealousy and revenge, secrets that should have sunk in the black sea surface, surfaced many years later. The past you are running from will one day catch up with you. Frankie and Sophie, good sisters who grew up together in a seaside town, have agreed to move out of town at the same time to experience a colorful life in the outside world. However, on a summer night when she was 21 years old, Sophie mysteriously disappeared at the old pier, and no one saw her again. Eighteen years later, Frankie, who left her hometown alone and was enjoying the city life as she wished, suddenly received news from the small town: a shoe floated from the sea, which was the same as the one Sophie was wearing when she disappeared that night. Frankie immediately returned home to find out what was going on. Unexpectedly, what appeared in front of her was her long-dead friend Sophie, who was still the same as she was eighteen years ago... The shadows of the past gradually dissipated, and the secrets and vows that once only belonged to the two slowly emerged from under the sea.