You can visit Yongma Land nearby Yongmasan in the Jungnang District of Seoul, which is a small abandoned amusement park area from the 80s. The entrance fee is 10,000 won per person. Make sure to bring cash, because credit card payment is unfortunately not possible.
One of the perks of traveling or living in Seoul is having the opportunity to visit several Korean drama filming locations all in one area or neighborhood. Just like the Haengdang Skywalk and its nearby Kdrama filming locations in Seongdong-gu, Seoul.