I was looking for the same one myself, and just found it. Name: Fun Territory Defense by the Optimistic Lord

Name: Fun Territory Defense by the Optimistic Lord.

Guy's father kicks him out. He saves a village. Builds a wall. Builds a lake. Gets merfolk to live in the lake and they try to marry their young daughter to him, etc.

I was looking for the same one myself, and just found it.

I was looking for the same one myself, and just found it.

I was looking for the same one myself, and just found it. Name: Fun Territory Defense by the Optimistic Lord