I forgot if the main character (MC) is banished, but he created a village with a castle that has a lake in the back. Later on, a princess mermaid moves in and says that she will be the wife of the MC. The mermaid and the villager/citizens started doing trades. I'm not sure if it's correct, but there was a scene where the MC routed the water river to the castle's moat for protection.

I forgot if the main character (MC) is banished, but he created a village with a castle that has a lake in the back. Later on, a princess mermaid moves in and says that she will be the wife of the MC. The mermaid and the villager/citizens started doing trades. I'm not sure if it's correct, but there was a scene where the MC routed the water river to the castle's moat for protection.

The MC is still a kid. The mermaid is also still a kid with his father and the rest their mermaid citizen who moves in at the lake. The story is similar to farming in another world.

I forgot if the MC is banished but he created a village with a castle that has a lake in the back, later on a princess mermaid moves in and says that she will be the wife of the MC. The mermaid and the villager/citizens started doing trades. Im not sure if its correct but there was a scene where the MC routed the water river to the castle's moat for protection.

Im just hoping to fjnd the manga so I can continue to read it. Thanks everyone.

I forgot if the main character (MC) is banished, but he created a village with a castle that has a lake in the back. Later on, a princess mermaid moves in and says that she will be the wife of the MC. The mermaid and the villager/citizens started doing trades. I'm not sure if it's correct, but there was a scene where the MC routed the water river to the castle's moat for protection.