The prime minister's son rescued a little blue carp that was caught by a fisherman on the street. The prime minister's son spent a lot of money to save the poor little blue carp, but he didn't expect that the little blue carp was actually a carp spirit and a fish beauty boy. The fish beauty boy fell in love with the prime minister's son at first sight. Mermaids who never believed in human beings actually fell in love with humans one day. The mermaid boy transformed into a thumping boy and finally got together with the human boy. However, the human boy did not know the true identity of the mermaid boy. At this moment, the mermaid boy actually had the human boy's child in his arms...