The article you never fix is the one that costs you Band 7

Korean has no article system, so we naturally skip or misuse "a" and "the" even in formal writing. But here is the cold truth: an examiner will take off for missing articles on Task 1 IELTS, and so will any native reader reviewing your email or contract. You do not get a second chance to clarify — they just assume you do not know the nuance. Fixing this one structure permanently lifts your writing from "mostly understood" to "band-ready.