In many languages conjugations are defined by the fixed template (the template itself can be large). In Korean, Japanese and other agglutinative languages the template is virtually non-existent (Wikipedia seems to give a 7-part template [1] which looks quite absurd for native Koreans---it should be considered a "common" regularizable subset of what people actually say).

[1] https://en.wikipedia.org/wiki/Korean_verbs#Finite_verb_endin...