I remember that the MC had a subordinate who used a style of suicide sword, it was something called "a blow, a death" (the blow was fast and intended to decapitate the opponent). Every time he used it he harmed his own health. The mc had a housekeeper and a mother. His father did not pay much attention to him (like other novels, he could not grow, he did not advance in the kingdom after many years ...) or his father was a strong cultivator, but he was not of his mother's clan, he was accepted and ended up dying for his enemies (I don't really remember who the mc's father was). The MC was from a famous clan that ran a certain city. The mc liked two elderly teachers (they always helped the mc in difficulties). His clan was wiped out by mysterious forces and those two elderly teachers sacrificed themselves to save the MC. The mc was a calm and intelligent person. Sorry for the mistakes, I'm using the translator. Thanks.