The Regressed Demon Lord is Kind

My whole life, all I wanted was power.
I churned the world into rivers of blood and eventually gained the title, "Demon Lord of Strength." However, all this became useless when I lost to a party of heroes.
As I laid dying, I was forced to listen to the hero's gibberish:
"If you are born again, I hope that you will live a kind life!"
When I opened my eyes again, I was back in the past.
This is the beginning of an ex-Demon Lord’s journey to live a kind life.

Original Novel:
KakaoPage, Naver Series, RIDI, MrBlue, Bookcube

Official Translations:
English: Wuxiaworld, Tapas, Wattpad Volume 1, Wattpad Volume 2