He has a pet which is not entirely loyal which grows at a faster rate than he does. If you can imagine all animals, insects and etc... mutating and targets humanity with albeit a weaker growth rate but still plenty fast, you can just kiss your sorry ass goodbye. Imagine rats, ants or any insects mutating at a fast pace. Just how would you even prevent them from mutating or reproducing. So MC's OPness is probably the worlds way to maintain balance. Just like some games, where the devs release OP heroes to maintain balance. If all heroes are OP, then in a way isnt it still balance?

MC kills the pet of a kid randomly in a street. The pet will mutate so he prevented a disaster but to do it infront of people is a little... He also created a post in a popular forum stating the incoming apocalypse and even stated that he is not lying and that it is not an alarmist post. Who would believe that! Still if I were in his position it would be hard to convince people that the world is ending. He also included a strong and simple breathing exercise which humans can use and practice to awaken their Qi. I was surprised here to be honest. I havent seen an MC giving some strong exercise to help resist the apocalypse. At most, the MC tend to get stronger alone while leaving the others to fend for themselves. This action made me laugh cause it was funny on how he did it but also showed that he cares for humans since he is doing his best to warn and strengthen humans fighting prowess in his own dumb way.

First he transmigrated from modern world to the future world when earth was already ransacked by demonic beasts.

Here MC receive his system and grow very quickly, but before he can grow very strong, he was killed by the aftermath of the fight between human expert and demon beast experts along with hundred thousands humans. MC able to absorb those souls along with their memories before he transmigrated back to the original modern earth era.

Here MC realized the future of mankind was threatened, thus he need to grow quickly and help other humans grow stronger.

Honestly I like MC's personality. He was shameless but in funny way.

There are several female characters that was introduced in the early story, but MC's interactions didn't indicate any sign of him as the kind who think with brain full if s*erm, like any other harem chinese novels. Instead, MC's focus was only to help humans grow stronger.

I truly hope that MC will keep his goal as his primary objective and didn't get sidetrack by girl's relationship