Ji Guosheng is a time traveler and comes with his own plug-in
"Brother Yuanyi, I want to learn the breathing of the sun."
Yuanyi "good"
"Brother Yan Sheng, I want to learn the breathing of the moon."
"Well, I'll teach you"
After learning the four breathing techniques of sun, moon, thunder, and water, he traveled back in time when Guo Sheng and Wu Sui were fighting.
Following Guosheng "???" This is, the Taisho era?
A purple figure passed by. Ji Guosheng "Wait, wait a moment"
Purpose: To make up for the regret of Demon Slayer