I'm Doing a Mission in a Fantasy World

Yuan Sen was originally just a small employee of the company, but things in the company made him leave his job angrily. He wanted to travel happily, but he died in a car accident. Too much unwillingness led to resentment and activated the system. The mission in the first world has started. After completing the mission, the skills, characters, and items can be brought back to the original world through random draws. But after returning to the original world, his family was indeed gone, but the perpetrator was still at large. He killed again in anger, but was targeted by the country. The attacker was no weaker than himself. The more he understood, the more cautious Yuansen became. It turns out that the world we live in is not as simple as it seems. Where does the system come from? I want to find out the truth. Martial arts, apocalypse, science fiction, cultivation... It doesn't matter who is blocking my way. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.