A new ride will be coming to Lotte World in 2019 called Across Dark. It's being advertised as an XR adventure on the walls of the 4th floor. I believe it's where the Dynamic Theater was, which was a 3d simulator theater before. I say I believe because I don't think I ever actually rode in the theater after my very first visit almost 10 years ago. Though the site says 2018, the construction walls say 2019.
Although it's replacing another screen ride so not increasing the count I think Lotte World might be competing with Universal for most screen rides: This new ride, 3 Wild simulators: valley, wings and jungle, dragon shooting, desperados, 4d shooting theater, beluga talk show, flying theater, ghost house 3D, Lotte's Air balloon, not to mention the pay and play VR zone in the basement and VR on Gyro Drop and French Revolution.
It seems to be by the same company responsible for Lotty's Balloon Ride, the 360 degree screen on the 1st floor and their flying theater: http://www.4thparty.co.kr/portfolio/new-cinematic-vr/