Not sure if I'm correct but I believe the 'wu' is supposed to be a like sound effect of crying in pain. sort of like 'waaahhh'. So Zhishu isn't calling someone's name.
Not sure if I'm correct but I believe the 'wu' is supposed to be a like sound effect of crying in pain. sort of like 'waaahhh'. So Zhishu isn't calling someone's name.