Hello Aspirant

I'm assuming by "online", you mean distance learning. Unfortunately if that is the case, I'm sorry but getting admitted to a reputed South Korean University will be a very difficult task.

A) Foreign universities require you to have a 4-year bachelor's degree under your belt

B) They demand your degree from a well-recognised college/university with at least a 3.5 GPA

C) They require a degree via regular college and not distance learning

You can still check out their website and see what the eligibility criteria is because that will be the best source of information.

Hope this helps