Male protagonist, shark man. Spit shark beads. In the last of those containers, the container next to the heroine should contain the selected women, and they are probably all virgins. The most weird ones are all colored hair. They are like mermaid. The heroine should become a mermaid and should not be able to reproduce in the future. And the heroine's mother should be the host chosen for reproduction. There are descriptions of shark people in "Shan Hai Jing", and there are also stories about shark people and mermaids in Western legends.
A few key details: The male protagonist-Shark, is there an underwater city? Glowing, underwater objects illuminated by the female lead's car lights. The mackerel population spit out blue mackerel beads. In the end, the female protagonist was shaped like a mermaid, especially the one with colored hair, which looked more like a mermaid. . . The overall story is interesting.
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