Situated near Hallyu World and KINTEX in Ilsan, Onemount is the largest multi-cultural space in the northwest metropolitan region. It is housed in three buildings with two underground floors and nine above-ground floors, for a total surface area of 161,602 square meters. Aiming to be the best playground in the world, Onemount features a shopping mall, snow park, water park, and a members-only luxury sports club, and also organizes various performances, events, and parties throughout the year.

Onemount Water Park is a huge urban water park that offers an array of both indoor and outdoor attractions. The water park offers spaces for sun tanning and enjoying the natural sunlight, and also hosts special poolside parties. It has nine water amusement facilities, with recreational facilities including a thrilling slide reaching 40 meters in x_height, a wave pool, a waterplay facility, and a running-water pool. Water also regularly splashes throughout the park, adding an element of excitement.