Become Invincible by Killing the System

A boy who traveled across the world got his own system, but he didn't expect that the system would disappear as soon as it arrived. The boy also went on the road to invincibility. Why does the introduction need a hundred words? It's really difficult for me. I really don't know how to write an introduction. Water, water, water, water, water, water, water, water, water, water, water, water, water, water, water, water, water. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.