When a monster is born into this world, all he needs to do is find the most important person in his life and protect her with his life. That's enough! Wentian, a young mixed-blood demon, escaped from his tribe's demon world. Coming to the land of the mermaid tribe in the Sea of Life, I met the mermaid princess Yu'er and embarked on a journey around the world. What strange and interesting things will happen during this time?