Sleep system, your combat power will increase by one level after taking a nap!
Walking system, each step increases your combat power by one level!
Blinking system, your combat power increases by one level after blinking!
Respiratory system, one breath increases the combat power by one level!
Heartbeat system...
Facing other people's awesome systems, Li Nian almost collapsed, because as a time traveler who has read a lot of online articles, he knew the importance of systems very well, but in this world, everyone except him had systems!
This made him suffer bullying for more than ten years, and he once wanted to give up on himself, but in the end he found that these so-called systems were scum in front of him...