After Becoming a Cannon-Fodder Bride to a Mermaid

[Screenshot saved as proof, no idea theft!] The merfolk kingdom lost the war and had no choice but to send someone to marry into the empire. When Yu You heard that he was to marry the person he had always adored from afar, he immediately packed up and set off for the empire. But the one he married wasn't the Fifth Prince. It was the Fourth Prince, a gloomy and ruthless man. He regretted it on the spot. He wasn't getting married. At the wedding, Yu You confessed to the Fifth Prince right in front of the Fourth Prince. After being rejected, he cried his heart out. The Fourth Prince livestreamed the entire process of being publicly cuckolded. Then, just as the original Yu You was crying his heart out, Yu You transmigrated into his body. Yu You, the poor sap left holding the bag: "..." Am I even going to live to see tomorrow's sunrise? Yu You unexpectedly saw the original owner's future. Three days later, the Fifth Prince would come to comfort him, and the two would make up. The original owner would secretly work for the Fifth Prince, giving everything to help him ascend the throne, only to die at the hands of the Fifth Prince's official fiancee. Yu You: Are mecha not fun enough, or is good food not tasty enough? Why would I work for a scumbag? Yu You kept the purpose of the political marriage in mind, stayed out of trouble, and settled into the life of an idle, beautiful fish. Unfortunately, people in the empire looked down on fish, believing merfolk to be weak and beautiful, and therefore suitable as pets. Yu You, who was used to doing whatever he pleased in another world, couldn't put up with that. After someone stuffed him into an aquarium and ordered him to dance in front of everyone, the beautiful fish finally snapped. With one slap of his tail, he shattered the aquarium. The beautiful fish transformed into a giant shark and sent everyone flying. He grabbed them by the collar and beat them one by one. "You look down on merfolk?" The onlookers shook their heads frantically. "Never, never." The Fourth Prince rushed over to rescue the fish, only to find: ... The beautiful fish glared at him, eyes red, and demanded, "Do you look down on merfolk too?!" The Fourth Prince silently glanced at the mecha that had just been flattened by a single slap of the fish's tail. ... No. Later, the entire empire went crazy for the beautiful fish. "Lord Fish, is there any hope for my mental strength?" "I'm dead. I need my entire mecha enchanted to be saved. Thanks." "My precious weapon is lying flat. It won't get up unless you enchant it. Please take pity on me~~" The Fourth Prince's expression darkened as he scooped up his beautiful fish. Taking him away. No appointments. [Screenshot saved.JPG] Revised May 3, 2020 Theme: Different species can coexist too.