Which episode is Zhen Huan's biography that Xia Zi Jr. was slapped?

Episode 6. Because I was guarding the palace gate at that time, I was called by the Yu family to help peel pecans. When Xiao tried to open the walnut with pliers, Yu grabbed it with one hand and let him peel it with his bare hands. Use sincerity to the emperor to frame Xiao. In addition, Xia Zi claimed that walnuts were too hard to peel directly by hand. However, Yu actually said a shocking sentence: "Want to play lazy bones? You have never been sincere to the emperor! The emperor wants to eat walnuts. What happens if a eunuch peels walnuts and his hands are rotten? " Xia Zi dared not disobey Yu Zhu's orders, so he had to peel walnuts directly by hand. After peeling, it has delayed the best time for the emperor to do things. Moreover, his own hands have been stripped to powder. The emperor asked him to slap himself in the face and let him learn a lesson. At this time, I rushed over and saw a small injury. I was anxious and distressed, and immediately stopped my errand to recuperate.