It's the perfect example of devs' work at JoongWon Games. They never finish anything. First they announced the 9dragons Begin in 2014, nothing happened. Then it was 9Dragons on phone for 2015 : nothing done. Now it's another game on phone eternal guardians (with a mistakes in release date on their website http://www.joongwongames.com/en/ ...)
I'm pretty sure too that this isnt 9Dragons. The Mechanic of this Video will never be the one of 9Dragons.