Why Do All These Monsters Have Health Bars?

Li Jing had transmigrated, finding himself in a modern world where everyone practiced cultivation.
Everything here relied on the Spiritual Qi obtained from personal cultivation.
Without family or money, and utterly clueless about how to cultivate, life was extremely difficult.
However, things changed when Li Jing walked into a Soul Chicken Store and discovered that he could see the health bars of the spirit chickens...
(The world view in this story is completely fictional, so do take it with a grain of salt.)