Su Mu traveled to the world of "Demon Slayer: Kimetsu no Yaiba" and met the widow Kamado Aoi in the beginning. Su Mu sympathized with the other party's experience, so he chose to help him and give him a job.

Slowly, I found that Mrs. Kui Zhi's eyes seemed to be looking at him more and more tenderly, and she seemed to be becoming more and more dependent on him.

Nezuko: Do ​​you want to be my father?

Butterfly Ninja: Do you want to be my brother-in-law?

Mitsuri Kanroji: Do you want to be my best friend’s brother-in-law?

………………

In Infinite City, Ghost Dance Tsuji Muzan looked at the group of female swordsmen following Su Mu, with deep fear in his eyes.

As an evil ghost, it was afraid of being dragged by these people to bask in the sun.