Xiaoxi returned to him from 11 years ago. He was able to skillfully transform his legs and could stay on land for a long time without replenishing seawater. He was also much taller than him.
So he moved back to the beach, one person and one fish, planning to live the rest of his life in peace.
However, his father is still very interested in mermaids...
Intention: I don't know exactly how to establish it.