Episode 21 recap: Silent Moon witnessed the recognition of the brother and sister.

During this period, the Crown Prince had been taking care of Moon diligently. He had attracted the gu worms to himself and even merged his blood with Moon, so they became truly united. The Crown Prince used this method to cure Moon's gu poison, but he said that they needed to engage in sexual intercourse in order to fully heal. Upon hearing this, Moon immediately thought of Silence. The Crown Prince was shocked and quickly sent Yu Bin to detoxify Silence.

Moon went to meet Silence, and they reminisced about their childhood together. Plus, they both had birthmarks, which caught the attention of the Princess, who quickly approached to inquire. It turned out the Princess had already thoroughly examined Silence. Both the Princess and Silence felt a bit embarrassed. Before leaving, Silence reminded Moon to take care of herself. The Princess still cared deeply for Silence. In fact, she had known Silence's identity all along, but now that Suixing Valley was no more, he didn't need to worry about anything anymore.

Silence wanted to visit the place where they grew up as children, and the Princess offered to accompany him. Duke Yin came to thank the Crown Prince and attributed his daughter's recovery to the Crown Prince's help. When Duke Yin asked about his daughter's marriage, the Crown Prince casually declared Moon as Duke Yin's eldest daughter, leaving Moon momentarily stunned.

Instead, this gave Moon a formal identity. The Crown Prince stated that from that day forward, his princess consort would be called Yin Yuejian. Moon found the name a bit unpleasant, but still left with Duke Yin. After they left, the Crown Prince suddenly felt unwell. In fact, he couldn't resist the gu poison. By luring the gu poison onto himself, he had inflicted significant damage to his body. The Crown Prince coughed up blood.