How many episodes is the old version of Zhu Huan Gege Wei Zi blocking the knife?

In the first episode of 19, a group of people are watching in a crowded market. Wei Zi and Gan Long met an old couple selling tea eggs. Suddenly, they pulled out a pre-stored short knife and stabbed Gan Long. Suddenly, the situation changed, and people in the city became assassins, often attacking Gan Long. Wei Zi saw that the situation was urgent and desperately went to find a knife for Gan Long. However, Wei Zi's weak body was greatly hit, and she fainted at once. When Qianlong saw this, he was frightened, and Erkang was even more worried. He quickly grabbed Dr. Hu for treatment.