Can You Get Rewards by Killing Monsters? I Blocked the Cracks in the Alien World

Cracks in the alien world appear, and creatures of all races descend. In order to survive, the human race was surprised to find that after killing a ferocious beast, extraordinary rewards would be revealed. Thus becoming an extraordinary person to fight against all races. Meng Liang, who traveled through time, received a system to transform his life. "System, change my temperament first." "Yes, it's the kind of temperament that can scare ferocious beasts out of their minds." "Change my eyes again." "It's like the kind where golden light shines in your eyes and the sky breaks apart." "And my hands, my feet, my blood, my hair..." Right. I heard that you can get rewards by killing monsters? Meng Liang, who obtained the system, immediately ran to a crack in another world outside the city. One after another, the powerful beasts were blocked. Just when the human race in the world thought that all living beings were nothing more than this. But found out. It turns out that there is a young man who has been guarding the cracks in the other world and has blocked countless world-destroying disasters for them! "Meng Liang, be our human race's guardian envoy!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.