Reborn With Unfaithful System

Unfortunately, he was killed, and after his rebirth, he was forced to tie up a system to get out of this predicament!
「 System: Please listen to me and bring the crown prince down. Otherwise, you will die!」
Qin Churen:? Then if I wear a green hat, won't I have to die too?
Crown Prince: Uncle, my concubine wants to give me a green hat every day
The Regent (smiling): Then give me this concubine. This King's stomach can support a fish pond.
What did the system count for? What was a green hat? This King wants you.