So, I'm based in Indonesia and Emperor and Bubblegum are available on Viu--which is a legal streaming site mainly accessible in Southeast Asia and Hong Kong--for free. Queen In-hyun is also on Viu, but it's not licensed in my country.
TL;DR Try Viu for 1, 3, 5 and use VPN for SEA countries (The Philippines, Thailand, Singapore, Malaysia, Indonesia) or Hong Kong.
Viu's website: www.viu.com
Viu's wikipedia entry: https://en.wikipedia.org/wiki/Viu_(streaming_media)
Six Flying Dragons seems to be licensed in the Americas on Viki: https://www.viki.com/tv/26480c-six-flying-dragons#subtitle_team
I suspect City Hunter is available on Kocowa in the US, since it's an SBS show and Kocowa holds a lot of rights for KBS, MBC, and SBS dramas in North America.