Invincible Zero System

When Yu Heng woke up, he found that he had become a system. He originally thought that he would live a life of clinging to the host's lap and being the big BOSS behind the scenes, but what he didn't expect was... He was bound to the host just because the system requires energy to operate, but he can absorb all kinds of energy to achieve the effect of endless energy. He only has one function, and that is to exchange. Everything he can think of and unexpected is available in the mall, so... Yu Heng exchanged for himself a black light virus, an ancient eye, and started a journey of cheating and invincibility in all the worlds... I'm a newbie, please give me some advice. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.