I Became Emperor for My Son

In his previous life, Zhao Heng was an idle prince who could only watch helplessly as his five-year-old son was poisoned to death.

Given a second life, he finally understood: if he wanted his son to become Crown Prince, he had to become emperor first.

So he played the pig to eat the tiger, dealt with his brothers one by one in the succession struggle, and took the throne for himself.

He thought everything was finally settled, only to discover that the throne was a pain in the backside: his six-year-old son was too young to become Crown Prince, his fifth brother commanded the Imperial Guards and watched him like a hawk, and three factions at court were at each other's throats. Worst of all, he'd fallen for that cold-faced female general.

In this life, he would crush everyone who stood in his way and put his son on the Crown Prince's seat.

As for romance and building a harem?

Maybe as a side project...