Underline that occurs when you type in Android EditText

Hello, we are currently making EditText, which is like a word processor. You must specify StyleSpan for each letter, so you should not apply the same Span for letters that are entered consecutively after one letter is entered. It's because when you erase the span, the span of other letters is erased, too

In order to prevent the occurrence of consecutive characters, I thought it was necessary to eliminate the underline when typing, so I did textNoSuggestions on Android:inputType, but it seems to work in English, but it doesn't work in Korean

Does anyone know?