What is double cleansing?

Have you noticed how BB Cream is TOUGH to remove? I did not believe what I had read about it, but I found that during my nightly skincare routine, my toner cottons were always dirty even after I had scrubbed my face clean with my cleansing foam. *Sigh*

This spurred me to hunt for better cleansing products and methods, which led me to discovering an essential part of the Korean skincare routine: Double Cleansing.

Korean "double cleansing" in a nutshell is...
Step 1: Cleanse your face with a creamy/oily cleanser to remove all the make up on your face.
Step 2: Wash your face using a foam cleanser to cleanse away the oil.

Result: Ta-da! Your face is supposed to be perfectly clean!

I was like, "What?!" when I saw the word "oily". I had thought that adding more oils to your face would just make your face worse. After all, cosmetics and skincare products are always going on about "Oil control", "Oil-free", bad oily T-zones, etc. So it's natural to think "Oil on face" = Bad!

Cleansing OIL as cleansers? O.O