@parklina321 When you meet someone in person for the first time, whoever they are, you should use with the formal form at first. after you are close to them, you can use informal depending on a situation.
@parklina321 If you are confused with formal and informal speaking, then just think that formal is first. Unless he/she is a little kid, you should talk to him/her using formal. And later if you get closer with him/her, you can use informal. You can ask : "우리 말 놓을까요?" "우리 말 놓아도 될까요?", "Can we speak informal, not using formal?" "May I speak to you using informal, not formal?" But you never use informal speaking to the elderly and use formal to elders.
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