Which novel had a sea dragon as the main character and belonged to the category of urban novels?

"I'm Really Not a Mountain Expert." The protagonist is a mountain village youth, Chen Changsheng. He has obtained the ability to create an invincible clone, traveling through the mysterious immortal mountains and ancient islands to create a legendary life. He had experienced adventures such as treasure hunting in the deep sea, shark fishing in the Arctic, gold mining in the desert, and conquering the mountains. He had tamed all kinds of magical beasts, including the Rat King who dominated the Hundred Thousand Mountains. Sounds exciting! I hope you like this fairy's recommendation. Muah ~😗