Saying "You"

Question 1

To anyone who you’re close with (aka. not best friends but just close), and who’s a similar age as you or older:

Answer 1

Use their name followed by 씨.
씨 means ‘Mr.’ or ‘Mrs.,’ and it’s a quite polite ending.

Sometimes you’ll need to say ‘you’ in Korean, such as if you want to specify that you’re talking about the listener, or just change the topic of the sentence to ‘you.’ ‘How about you?’ ‘What about you?’
For that, most of the time you’re either going to use a person’s name, or their title.

Question 2

To anyone else who you’re not close with, or they’re much older than you:

Answer 2

Just use their title.

A title can be anything from their job title to just the relationship that person has with you.
Here are a few examples of that: ‘older brother’ or ‘mother’ or ‘teacher’ or ‘boss.’

Question 3

If you need to say ‘you’ to a stranger, and you’re not sure how else you can address them:

Answer 3

You can say 그쪽.

However, only try to use this word momentarily until you can figure out a better way to refer to them.
Otherwise it can sound a bit rude if there’s a better way to call them, and you keep using 그쪽.

Question 4

당신

Answer 4

당신 can be used whenever you need to say ‘you’ and you do not know who you are speaking to.

This is commonly used in speeches, or in print, but do not ever say ‘you’ with 당신 directly to someone as it sounds quite rude.

Also, married couples might sometimes say 당신 to each other, to kind of mean ‘darling’ or ‘honey,’ but this isn’t extremely common.

So basically, avoid 당신.