Koreans speak English. I think it's really difficult for China people to listen to English (because of their own tone and local habits). Of course, if we don't learn standard pronunciation systematically, the English we speak in Chinese mainland won't be very good ... Every country speaks English with its own dialect. Therefore, the landlord can imagine the tone of Korean English ... but due to the popularity of English nowadays, many Koreans will send their children to study in Europe and the United States if conditions permit. Most of those Koreans have good English, without Korean pronunciation and intonation, which is the case in any country.

I hope I can help you and adopt it.