Cat's Tea: the Madman's Stage

No violence, no blood, no cp, only about career and not love, and also a nanny. The male protagonist was a little crazy, but later he became normal and only had some fun sometimes. He is an immortal species. "I, Jiang Yan, will be the man who subverts this continent!" "Demons? Hahahahahahahaha!" "Morality? Bottom line? Those are the shackles of the weak! As for me, if I want to love, I will love hysterically, and if I want to hate, I will hate with all my heart."