Yeouido Hangang Park 여의도 한강 공원
It's the most famous place to watch the show but you need to be aware that it will be the most crowded. The subway may not stop at Yeouinaro station if it gets too crowded. In that case, get off at Yeouido station #3~6 (Line 5), Mapo station #1,4 (Line 5) or Singil #3 (Line 1).
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