Typing Korean characters through IME(bundled in Windows 10) outputs oddly. Please see next:
There is some irregularity in typing in Korean. Basically, Korean characters are composed of Consonant + Vowel + Optional secondary consonant . That combination forms one single character; and the pronunciation varies according to its components — meaning, 1 character equals 1 syllable. In consequence, the typing software generally tries to hold your input until the formation completes and release the formed character into the editor afterwards. (I am not sure if this relates to the issue, just providing some context.)
As of now, I am escaping this by typing just one character at a time then add space + delete the space with backspace: this action sort of resets something and allows me to continue writing another character.