The Strongest Possession System

While out on a trip with his coworkers, Chen Xing was approached by a mysterious woman who demanded that he marry her. He refused to the death, but never expected her to take him to another world. Fortunately, he accidentally bound himself to a Possession System and escaped her clutches.

Work hard at cultivation? No way. Kill people and recycle treasures to break through. Why bother cultivating the hard way?

Learn cultivation techniques? No way. Possess someone from a different plane and gain their abilities. Use an ability once, and its proficiency goes up. Why bother laboring over cultivation techniques?

But why does this godforsaken System make me complete so many godforsaken missions?!