I was very confused for a few moments! He says that’s just how Koreans pronounce saxophone, but I’m not sure if that’s how Koreans pronounce it or just how he pronounces it. If you have a Korean partner who is more comfortable speaking in Korean than English, ask them. For my husband at least, it’s because he is pronouncing ‘sax’ like ‘sex’ and dropping the ‘o’ sound. I was relieved to find out his conservative Christian aunt was not in fact taking up work as a phone sex operator, but instead learning how to play the instrument the saxophone!