Upon inquiry, I learned that the second episode of "Walking in the World" is: against an eight-foot adult, the protagonists have changed their bodies after defeating the creeping. I asked the relevant experts to understand, but I couldn't answer them. Later, the two sisters went to the inner world to find the teacher of Bird Son, got to know Shen Yin and an eight-foot-old man, and learned that they met a living person who took a lunch because of squirming in the inner world, and learned about his wife's Shen Yin from there.