I Am Keeping Vigil in the City, and I Am the Reincarnation of the Judge from the Underworld.

Urban fantasy + cute baby + refreshing revenge story Su Qingyuan, the guardian of a wealthy family whose family was wiped out, raised a reincarnated little king of hell, Su Nian, and used the rules of the underworld to crush the world's powerful people, clean up the traitors in the underworld, and pacify the troubled times of all races. In the end, mother and son joined hands with the male protagonist Lu Chenyuan to become the co-lords of the three realms.