The story revolves around marine biologist Li Qiumo, who accidentally witnesses a luxury cruise ship destroyed by an unknown deep-sea sea monster, thereby getting entangled in a long-sealed deep-sea secret. He gradually explores the truth, uncovering the hidden past of the Alpha gene experiment led by his father, while reuniting with his long-lost childhood sweetheart Lin Shuyue, only to find that she has been transformed into a jiaoren puppet.