Official forms at government offices usually don't have to address anyone with an explicit "you". The context is making an application or notification, so most things mentioned are for the general public. When explicit reference is needed, they use a third person noun such as 주민(resident), 시민(citizen), 신청인/신청자 (the applicant), 해당자(those who qualify), and so on. e.g. 신청인은 이 사실을 관할 사무소에 신고하여야 합니다 = The applicant must notify the relevant office of this fact. In stores and other businesses where they address people in a more friendly environment, they use 고객님(customer) or 손님 (informal form of 고객님). Additionally, the honorific form of a verb implies that the subject is the person served (because honorific forms are never used for oneself), so using honorifics already tells you the sentence is talking about "you" the customer. e.g. 1. 멤버쉽 카드를 원하시는 고객님은 안내 데스크에서 신청해 주세요. (subject is 고객님, "you" as a customer). 2. 멤버쉽 카드를 원하시면 안내 데스크에서 신청해 주세요. (no subject is included) Even though #2 has no subject, 시 (the honorific suffix) in 원하시면 immediately makes it clear that it's talking about the customer. This rule about honorifics applies in any adult conversation. For example, if someone starts a sentence with 바쁘셔서..., it means "because you(the listener) are busy", not the speaker themselves. If they were referring to themselves, they would say 바빠서 without the honorific 시. So if you want to say "you" as the subject, all you need to do is make the verb honorific. This is one reason why the subject-less sentences don't create much confusion.