How did Wei Ying know that Liu Xuan was still alive in the TV series The Legend of Ban Gu?

Let's talk about the basic emotional lines of the hero and heroine in the TV series "The Legend of Uncle Ban"! In this play, Wei Ying's fiancee is Liu Xuan. Because she was killed by the Huns, Wei Ying couldn't stand the pain. She has been immersed in the shadow of her fiancee's death for many years and is cold to others.

Wei Ying and the heroine Ban Shu have known each other since school. Banshu, the heroine, was an orphan girl on the grassland since she was a child. She is bohemian, loves freedom and hates being imprisoned and imprisoned. Because she is not used to the life and culture in the Central Plains, she has always been very unrestrained, so she often makes a lot of jokes at school. Because of Ban Shu's cheerful and straightforward personality, Wei Ying's iceberg was finally melted by Ban Shu's enthusiasm, so they became a pair of heart-to-heart lovers at school, and their feelings gradually warmed up. Usually at this time, the development of the plot will not make it too easy for men and women to be together. Love that has experienced hardships is always the sweetest thing, so the screenwriter let Wei Ying know that Liu Xuan is not dead at this time.

Once, when students were having a barbecue in the inner hall, naughty male students found a letter to Wei Ying, thinking it was a love letter written by Ban Shu. As a result, Wei Ying recognized Liu Xuan's notes at a glance, but Uncle Ban said that the letter was written by Mrs. Mochow and asked her to take it back to the big fellow. Wei Ying inferred from the word Mochow that Mochow was Liu Xuan, because Zi Xuan meant to forget troubles, and forgetting troubles was Mochow. Thus, Wei Ying knew that Liu Xuan was still alive.