Pass Through and Become a Grain of Sand

After a nap, I woke up and found that I had turned into a grain of sand. The system told me that I could level up by basking in the sun. After tens of thousands of years, my experience bar almost exploded, and I finally took human form and turned into a sand monster. The system also told me that by killing monsters in the world of monsters, I could upgrade to the monster king. So I started a long and ruthless journey of killing and upgrading... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.