恩人 おんじん
onjin

Noun

1. benefactor; patron; person to whom one owes a great deal; person to whom one is (deeply) indebted

わたくし恩人 おんじんにしたことを、恥 ずかしく おもった。
watashiwa onjinni shita kotōha zukashikuomotta
I was ashamed of what I had done to my benefactor.