Through Time Travel, I Actually Differentiated into an Omega

[Two male protagonists + non-danmei + abo world + adventure + fantasy], when he woke up, Li Fei actually traveled to the abo world, and even differentiated into an omega. He was marked by alpha, and his butt could not be saved. If he went back, he would be laughed at for the rest of his life. In order to save his butt, Li Fei decided to find out the truth about the world.