Invincible Upgrade

Traveling to another world with an upgrade system and hundreds of novels, he became the good-for-nothing young master of the Luo family who raised horses. Can't practice if the Dantian is broken? I have an upgrade system. To me, breakthrough means just killing monsters, doing tasks, and occasionally killing people. It's so easy! There is no skill... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.