Oreo Pizza At Pizza Mall

Near the Express Bus Terminal Station of Seoul, there is an all-you-can-eat pizza buffet restaurant called Pizza Mall.My friend who's been living here longer than me told me that there used to be a lot of these restaurants in Seoul a few years back. However, they almost disappeared according to him. And you know what? That's a shame, because where else would I find an Oreo Pizza (with cheese and chunks of Oreo)?