A professional photo with a big smile is best.

I know that a photo is not a normal employment procedure in the West but in Korea and parts of Asia, a photo is a very important part of your application.

Koreans (as well as Chinese and Japanese) believe in Gwan-sang, which is the art of face reading. The people of the East strongly believe that you can tell one’s character and personality through their facial features. This is why a photo is required for all job applications, even for Korean nationals.

in-person interviews are not possible, the photo and resume are going to make your first-impression. A friendly appearance (the bigger the smile, the better) always gets the best response for Korean employers)

I look forward to receiving your application.