Just noticed he calls him Kaede here but in the extra it's Hayate? http://www.mangago.zone/read-manga/oh_my_young_master/uu/oh_my_young_master-chapter-3/5/
The translator probably mistook the kanji reading at first. In chap 4, Hayate is used as well.
Just noticed he calls him Kaede here but in the extra it's Hayate? http://www.mangago.zone/read-manga/oh_my_young_master/uu/oh_my_young_master-chapter-3/5/