Answers

2014-10-05T20:24:09+08:00
Chalja - informal, used with close friends and little kids younger than you 
Chaljayo - more polite than chalja, used with people you're not as close with, but still familiar with 
Annyeonghi jumusaeyo - quite formal, used with elderly people or people you have great respect for. You usually bow with this one since it's formal.
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