On 4 October 2014, Just go Yeouido Hangang Park.
No entrance fee, you only need your sight and long sleeves cloth or jacket.
More detail : 2014 Seoul International Fireworks Festival Website.
Also I like this blog’s picture about Frameworks Festival. Blog does not support English, but you can watch pictures.
http://blog.naver.com/nzeozzang/220139532421
http://blog.naver.com/nzeozzang/220139504494
