[tasogare]

> I guess maybe Korean (Hangul is phonetic, no?).

Wrong, Korean writing is morpho-phonologic and has complex rules for transforming letters to actual pronunciation. And those rules applies at three different level (whatever position in the syllable, across syllable boundaries or not, or just within syllable).

[quartesixte]

But even then, the rules are fairly consistent and mostly logical. And even then the transformations are not drastically different from the consonant’s “base” sound.

Some of those transformations are a byproduct of hangul losing a vowel and a handful of consonants, and Korean itself going through a change similar to Middle English > Modern English over the course of Joseon’s 400+ year history.

[nulbyte]

I would say Hangul is regular, not phonetic. Sounds might change depending on their position when written, but I wouldn't call it particularly complex, certainly not compared to English orthography.