Galleria Mall in Apgujungdong District, Seoul has been around for as long as I can remember. About 15 years ago or so, they installed these animated LED lights that display flowers, people, and more.
BTW, Galleria Mall is exclusive to selling famous brands around the world for brand whores. Of course, you will be paying a hefty tax over buying them in the U.S. so I would never shop here. (unless I lived in Korea)
Galleria mall also has another building across the street, which isn’t as spectacular.