Which episode is the letter left by Erkangyuan when Princess Zhu Huan escaped in the second part?

In episode 4 1, a minister sent by the emperor returned to the palace to report the situation, saying that Wei Zi was blind, Erkang and Yongqi were injured, the golden lock fell off the cliff, and the incense disappeared. The emperor was sad and angry, and the minister took out the stationery brought back from the quadrangle. The emperor saw at a glance that it was Erkang's handwriting, written by Yu Qian, and it was hewn out of the mountain with a lot of hard work, and the fire burned us. What a strong and painful sentence, the emperor was heartbroken. Compared with the crimes they have suffered, their mistakes are nothing. He just wants to find the children as soon as possible and let the doctor cure them. He repeatedly told him to make unannounced visits and not to startle him. Although he is above others, he is the father of an ordinary family at the moment, and his children are wronged and anxious outside. Is this the episode that the landlord is looking for?