Lu Li wasn't worried about the existence of the Leng Family. The Central Imperial Universe could be conquered by other warriors from other universes for all he cared.
He was from the Heaven Reverse Universe. The other universes could be in tough battles, but he still wouldn't concern himself about that. He only worried about his own existence. To survive, he could and would play hard.
When Leng Wuxin gave him that slap on the face, he was brought back to reality—he was dancing on a blade. One careless move, and he could be ripped open. He must put away his kindness. He must be cruel and heartless just as Lu Ling had been. He could employ any means and kill anyone just so he could survive!
However…
This was only a working plan, and it might prove to be unpractical. After all, Leng Family had a history of over a million years. The other families were unlikely to declare war against Leng Family for the sake of a few disciples.