Miss Qidiao and the young master are well matched.
During the wedding, she made harsh words:
Unless something happens to you and you die, I won't have any feelings for you
Mr. Yi had a deep affection for Miss Qidiao, so he naturally allowed her to make things difficult for him after she came to the house.
So he was killed by her.
It really corresponds to the words that Miss Qidiao often talks about.
"If heaven had feelings, the sky would also grow old. If I had feelings, you would have died long ago."