Lotte World, a major recreation complex in downtown Seoul, features the world's largest indoor amusement park called Lotte World Adventure and an outdoor theme park called Magic Island. In celebration of Halloween, it undergoes a makeover through cute mascots and pumpkin props. As darkness falls, however, the park transforms into a giant zombie factory, threatening to infect guests with more powerful viruses. Halloween-inspired rides and performances are also available during the festive season.