What episode is the dialogue between Wei Zi and Lu Zhen?

In episode 19, Lu Zhen was punished by kneeling in the snow, and Gao Zhan was about to take him back to the palace. Lu Zhen woke up and ran away. He learned from Wang Shangyi that Gao Zhan was the King of Long Light, so he returned to Gao Zhan. Gao Zhan asked Lu Zhen for forgiveness, and Lu Zhen said: Cheating is cheating, and it won't hurt people just because they look good.