Takes place in a fantasy world that contains mermaids

Xiao is a marine biologist, him, his mentor, and other marine biologists where out at sea to see what they could find. They were possibly hoping to find a merperson, a rare species. On their fifth day at sea, they seemed to catch something big in their fishing net, they pulled the net up to the dock to see they caught a mermaid! The only problem was that the mermaid they caught, was you.