Because (Emphasis)

Use -(으)니까 for emphatic reasons or with commands/suggestions: Conjugation: • Consonant stems + 으니까: 먹다 → 먹으니까 • Vowel/ㄹ stems + 니까: 가다 → 가니까, 만들다 → 만드니까 Key differences from -아/어서: • Can use with imperatives/suggestions: - 늦으니까 빨리 오세요! = Come quickly because you're late! • More emphatic, often personal discovery - 해 보니까 쉬웠어요 = When I tried it, it was easy Common uses: • Justifying actions or requests • Expressing discoveries ("when I tried/saw...") • Giving reasons for suggestions