Sorry, Please, and Thank You:
They're probably the most important words to learn in ANY language (especially if you're going to be travelling there!)
Here are a few ways to say "I'm Sorry" in Korean!
저기요! - (chyeo-gi-yo)
Grabbing someone's attention. You can use this in restaurants to get the waitress' attention to order or to call out to someone if they dropped their wallet, etc.
잠시만요 - (jam-shi-man-yo)
Pardon me, coming through! If you're on a crowded train trying to push your way towards the door, just say this while motioning that you want to get by.
죄송합니다 - (chwae-sohng-ham-ni-da)
Sorry! Use this more formally. If you bump into someone on the street, spill your drink, etc. Used for strangers and for thing you really need to apologize for.
미안해요 - (mi-an-hae-yo)
Sorry! Slightly less formal and for less huge apologies. Little mistakes and accidents with people you know.
미안 - (mi-an)
Sorry! You can use this with friends for little things like "미안 I'm late!" or if you step on their foot :D Tiny sorries!