On an isolated island shrouded in thick fog all year round, all residents have lost their past. Lin Zhou, an amnesiac who wakes up on the beach every day, is content with this moment of tranquility. Until a mysterious pendant washes ashore by the waves, containing a rusty clue to the past. This discovery broke the fragile balance of the island and ignited his desire to explore the truth. He must choose between the comfortable "now" and the "past" full of unknown dangers, and the silent lighthouse keeper on the island seems to be the key to all these secrets. Is he pursuing redemption, or another deeper abyss?