Titles Are Preferred
Not only is Korea a more conservative society, but they’re also a very respectful one as well. As a result, people will often refer to each other based on titles rather than using each other’s names.
This applies doubly when speaking to someone older than yourself since age is very much respected in this country. It can get a little tricky at work, especially if you’re a manager and your employee is older than you, but they make it work.