Three Kingdoms: I Transmigrate as He Jin's Son, and I'm Turning Things Around

I transmigrate as He Jin's legitimate son, with the perfect setup from the start: my father is the grand general, my aunt is the empress dowager, and the emperor owes his throne to my family. But there's a problem with this perfect setup: my father just died. I have no brothers to fight over the inheritance, and the troops, titles, and honors are all mine. But I know exactly how He Jin died.