Types of saying "Good Morning" in Korean

좋은 아침입나다 (formal) Romanized : joheun achimimnida

좋은 아침 / 좋은 아침이에요 (informal) Romanized: Joheun achim / joheun achimieyo

Formal: Say it to the people you didn't know or you're not close to. Informal : You can say it to your friends or people closest to you.

Hope you learned from this. Thank you