You are looking for a homemade container in a park near Itaewon. Unfortunately, the muggle factor, in the summer, is pretty high with all the children and adults at play. No pen, so BYOP. The park is kind of hidden, but a great place to bring children. Exercise equipment is located at the park, as well, in the event you want to get in a workout after you locate the cache. No need to bushwack any vegetation.
No SPOILER pictures, please. All SPOILER pictures will be deleted.