BTTH: Severing The Heavens

Yoriichi Tsugikuni, the unparalleled swordsman, died burdened by regret. But fate offers no rest. He awakens in the Dou Qi Continent, inhabiting the body of Xiao Ning—a petty bully beaten to death by the "Heaven’s Chosen," Xiao Yan. In a ruthless world where strength is law, the arrogance of a minor villain is replaced by the terrifying calm of a master. With the Transparent World guiding his blade and a vow to protect his new family, Yoriichi begins a new cultivation journey. The Sun Breath has found a new fuel. The Sun is rising. The "Waste" is gone. And the Dou Qi Continent is about to witness a heat that even Heavenly Flames cannot match. — Description from novelcodex.org