I don't know korean, but what I'm about to say is true for all languages. Post the whole paragraph instead of just a sentence if you want a better reply. A lot of things can change depending on the context.
"What should/must I/we do [for you/him/her/them/it] so that you/he/she/they/it won't be afraid [of (insert thing that is causing the fear here)]?" That's the best I can give you without any context, but I can break down the grammar for you too if that'll help. Source: ...I'm Korean and I speak it natively...? Does that count?
@Ritsuka So like, and this goes for whenever you ask for translation help in general, but you're gonna need to provide at least a little context. Especially when it's for a heavily implicit language like Korean.