I've already become a Titled Douluo and now the System shows up?

Qin Xiao transmigrated to Soul Land and awakened one of the ten fierce Thunder Emperor Spirits.
Born with immunity to divine thunder, he bathed in bolts of lightning as leisurely as if he were soaking in a bath.
Refining thunder. He transformed thunder into pure Soul Power, causing his cultivation level to advance by leaps and bounds.
Not a babysitter, and in opposition to the protagonist group, keep reading for surprises.
By the age of eighteen, he reached the lofty realm that countless Soul Masters yearn for but cannot achieve: Titled Douluo!
What Hao Tian Hammer, Angel's Martial Soul? They were utterly incomparable. The Thunder Emperor Spirit against them was like fighting in a completely different dimension.
It was also in this year that he awakened the newcomer guidance System...
[Ding, newcomer guidance mission released.]
[Rookie Soul Master, your talent is barely adequate to join Shrek...]
Qin Xiao looked at this mission and fell into deep thought.
I, Qin Xiao, a Titled Douluo, join Shrek?