Action

When Cheon Yeo-Woon is about to die someone from the future gives him a nano machine drastically changing his life. Now he begins his journey to become the strongest martial artist
The MC is cool because he still trains and works on himself instead of letting the system do everything for him. He also works smart when finding reliable allies which should lessen drama with his group (no backstabbing type of thing)

Free on Webtoon
A God gives people the power over animals. The MC believes he has a weak animal but later finds out it's strong changing his life forever
This is one of the first webtoons I ever read. The art is very much old webtoon style and the story is pretty good. I liked how 'small' details in the beginning played a huge role in other parts of the story