@givemersspls Concerning the fame of the weapon, if it was widely known the Mo family has a super weapon (like Excalibur, the most famous sword in the world), then it would be somewhat reasonable Mo Yan would be angry Xuanyuan Yu just went forward and tried to use, or even touch, such a treasure, even if nobody had specifically introduced it to her. As it is, she simply had no idea. Even the witch aunt didn't bother to mention there's a hands-off weapon lying on the altar in the temple where she locked Xuanyuan Yu in.
Well, to be reasonable, the dude was only angry at Xuanyuan Yu because he didn't like how she got hurt. But being tsundere, he expressed it by being angry at her.
They are all adults and highborn to boot. Xuanyuan Yu married into the family for political reasons. In my opinion it would be prudent to educate her quite a lot about the matters and customs of the family. In a sense the witch aunt seemingly tried to do it, but we all know she's a baba yaga who only wanted to make Xuanyuan Yu's life miserable any way she could, so she wouldn't have provided her with any kind of useful information. I again say it was Mo Yan failing his responsibility to make sure his wife could work as a lady of the house by allowing her to know everything she should know. Mo Yan apparently couldn't imagine the ogress might have any malicious intentions, so he was willing to leave it up to her.