For the case of Aheui, it is essentially a Hangul-branded version of Befunge [1] (or if you are interested in the history of esolangs, it is actually more like Orthogonal [2] but Aheui didn't really derive from it). Besides from the fact that Aheui's usage of Hangul is novel, I wouldn't consider it a fundamental paradigm shift.

[1] https://esolangs.org/wiki/Befunge

[2] https://esolangs.org/wiki/Orthogonal