After I Lost My Memory, They Insisted I Was the Youngest Son of the Xu Family

[ABO, two male leads, adored by everyone, pseudo-interstellar setting. A refined scoundrel of an older brother, ten years his senior, who dotes on his Alpha lover * a gentle, sickly Omega beauty who coughs every few steps] Xu Ying knew he couldn't remember anything from before he was ten, but he didn't really care. He carried on tinkering with pheromones at his teacher's research institute. That was until a strange man kept showing up to see him. “I have no money, and I even have an incurable illness. What about me makes you think I'm connected to the Xu family?” The Xu family was famously wealthy across the Federation. “You are Xu Zhiyan,” Zhou Chen insisted. “You're a member of the Xu family... and, if you don't mind, you can be a member of the Zhou family too.” Xu Ying... Xu Ying minded a lot. But when he finally met his family, his parents, and his older brother, and heard them call him “A-Yan” in choked voices... All right, he gave in. “I guess I really am.” This is only a pseudo-interstellar setting, included to develop the ABO premise. The story has almost nothing to do with space.