Adamas
An object made of adamant -- the most rigid steel or iron. Anything which is inflexible, firm, or lasting. (figuratively, of one's character)
In Greek mythology, Adamas was a Phrygian participant during the Trojan War.

I have been watching Korean dramas for quite some time now and as always, the ending makes or breaks the whole drama story. Adamas didn't escape this trend. It was promising at the very beginning and stars prominent actors like Ji Sung (Devil Judge) and Seo Ji Hye (Dinner Mate, Crash Landing). This drama has its own highs and lows so I didn't rate this with the highest stars I can give.

But if you are into mysteries, problem-solving, and action and are prepared to give 16 hours of your precious time, then go ahead and watch this drama.