This could have been one of the most epic series if only the revelation parts weren't so anti-climatic. The whole suspense and mystery revolving around the Gwangju who went missing for decades is not justified.
I seriously can't stand the villain character. His arc is poorly written. I don't understand how his scheming works with the most powerful people of the nation when his arguments are so weak, it can seriously be answered by "so what? get lost!" Urgh.
Even the acting was pathetic and forced, it's painful to watch.
Other than that, the other characters, screenplay, cinematography, special effects, muscial score, ost is still worth the watch.