EPIC FAIL! Hyundai MRL elevator

Been long time since last time i uploaded a video. I'm losing interest of recording elevator videos, and simply i've never been riding any interesting elevators these days.
But today, smth rlly unsual happened. A Hyundai Elevator went off-crazy after short power outage happened. I wasn't expecting this, and tbh this is rlly interesting. I'd greatly appreciate if someone is willing to explain what happened in the comments section! :)