Takes place atop the high plateau of Haneul Park, an eco-transformation marvel built over an engineered landfill. In October, the entire hilltop becomes a shimmering ocean of silver eulalia grass. Extended night openings feature color-changing LED lighting, acoustic busking, and sweeping evening views of the Han River and Seoul skyline. Free park admission; electric shuttle buggies (*Maengkkongi Tram*) cost 3,000 KRW return.