I look up to you is directly translated into 나는 너를 존경한다. But we rarely use it in any cases. If you are in the same age or older than the person, you can say, 나는 너를 존경해. or 나는 너를 존중해, which means I respect you. If you are in the lower position or younger than the person, you can say, 저는 당신을 존경합니다. or you can insert her/his name/position, 저는 Courtney씨를/Courtney님을 존경합니다. // 저는 Courtney 선생님을/부장님을/선생님을/교수님을 존경합니다. Korean is a language that puts emphasis on politeness, so Korean learners should be careful of these polite expressions.

Yes, thank you!

Does it mean admiring you? or respecting you? If so, in Korean, you could say "존경하다". I look up to you can be translated into 나는 너를 존경한다.