Both mermaid posters were first published. Although the mermaid on the screen looks beautiful and fragile, be careful, they will also show shocking horror underwater. The name of miss mermaid in the single poster is Selena. She is kinder than her sisters, so she was caught by Blackbeard as a tool to find the fountain of youth. She will also write an epic romance with missionary Philip in this episode (holding her young man in double posters), forming a sub-story outside the main line of finding the fountain of youth.
So maybe the mermaid saved him because she was kinder than her sister?
Because the pirates abused the mermaid, it was the missionaries who had been protecting her. She thinks the missionary is a kind person.
People who are kissed by mermaids can gain the ability to survive in water. When they lured the mermaid with lights, one of the pirates mentioned the pirates in love.