Gou Cheng is a Titled Douluo, and he is here to counterattack the system?

Description

Lin Fan traveled to Douluo Continent and found that he had no golden finger and had average talent, so he could only practice diligently.
Forty years later, Lin Fan worked hard to achieve the title of Douluo. However, a system suddenly appeared that said that Lin Fan could counterattack and become a supreme god.
However, Lin Fan fell into deep thought while looking at the first task.
"Please host join Shrek and defeat 12-year-old Tang San (Great Soul Master Level 29)."
"The delay in your system is a bit serious."