If you want to see a movie at a Korean theater you have several options. They have everything from 2D to 3D, 4DX to SphereX, Sweetbox to Veatbox, and even IMAX. Most American movies are in English with Korean subtitles. The main exception being animated movies. Those tend to be in Korean.
You are able to get movie tickets directly from CGV. Just click on “English Ticketing” in the upper right corner.
Military Discount: CGV offers a military discount. Present your military ID when purchasing tickets, not available online. It is only for 2D movies.
Cine in Korea allows you to buy tickets to any movie in South Korea. They apply a small surcharge to each ticket.