In "The Queen of Surprise", which episode of Taidi discovered that the maid-in-waiting was the foster mother? What is the introduction of that episode?

Plot:

Yuan Shundi recalled that if the maid-in-waiting was her mother-in-law, she would have admitted it. He hastened to inquire about his mother. As an adult, Yuan Shundi never looks at herself when she sees her. He ordered her to look straight, and Yuan Shundi's heart suddenly became tense. Yuan Shundi thinks she may be the mother. Chengniang gives clothes in the water under the pseudonym of Lianger. She was afraid that her identity would be seen by the emperor. At this time, the queen summoned her and ordered the abortion medicine to be put in the soup. Tang Jishi saw Chengniang coming out of the queen's bedroom and confirmed that her sister had used Chengniang to murder Park. Unexpectedly, the adult will help them.

The Queen of Miracles is a moon drama on 20 13 of South Korea's MBC TV station. The play was co-written by Zhang Yingzhe and Kyeong-soon Jeong, directed by Han Xi and co-starred by Ha Ji Won, Joo Jin Mo, Ji Changxu and Bai Zhenxi. The play tells the story of the heroine Qi Chengniang, a Korean woman, who changed from a humble maid-in-waiting to a queen of the Yuan Dynasty.