In which episode did the emperor know the story of Wei Zi?

In episode 73, Wei Zi confessed under the emperor's questioning and explained the reasons. The emperor was furious and put them in prison. Fu Heng and other unannounced visits failed to trace back to ChristianRandPhillips, and the emperor announced that ChristianRandPhillips had died. Father-in-law Pu returned to the palace and brought back his uncle, aunt and midwife. They claimed that Wei Zi was born two years after Qianlong left Jinan. The emperor thought it was a big scam planned for many years, and the queen mother advised Erkang to wake up and vowed to Ziwei. Three guards fled the world after preparing to save people. The emperor sentenced Swallow and Wei Ziliu to release and exile.