However, as Seoul expands and standard language supremacy spreads, young people in Chungcheong Province, including Daejeon and Sejong, do not use original dialect, or use very little of it.

Linguist Do Suhee reports that the Chungcheong dialect experiences an umlaut, resulting in changes like <ㅏ> (a) raising to <ㅔ> (e) and <ㅡ> (ɨ) fronting to become <ㅣ> (i), triggered by a nearby high vowel /i/ or glide /j/.

[1] And there is a characteristic that is observed only in the Chungcheong dialect, which is that the vowel <ㅛ> (yo) is changed to <ㅠ> (yu).

For example: Do Suhee found that the Chungcheong dialect increases the tenseness of lax stops when in the initial position.

For example, the lax stops <ㄱ,ㄷ,ㅂ> (k, t, p) transform into /ㄲ, ㄸ, ㅃ/ (kk, tt, pp) when in the word-initial position.

The representative cities of this dialect region include Daejeon (대전), Sejong (세종) and Cheonan (천안).

The most widely known and representative of Chungcheong dialect is that the standard pronunciation <ㅛ> (yo) is changed to <ㅠ> (yu).

The Chungcheong dialect usually replaces the standard '~겠다' (gettda) at the end of sentences with '~것다' (geotda) and '근디'(geundi) (but) instead of '그런데' (geureonde).