Spare Me, Great Lord!

Spare Me, Great Lord! manga summary:

After the revivification and return of the spirit energy, men and women did their best to capture every strands of spirit energy and train, except Lu Shu, with his Negative Emotion System, he becomes stronger by taunting others! He only wanted to protect his younger sister, but the change of an era in unavoidable, then all he could do was… to taunt others in passing, and become the strongest! Then, are you ready? Here comes Lu Shu, ‘The Great Demon King’~