Overall the story is sames like every k-dramas 2000's. Betraying, misunderstanding, revenge, or something like that.
From the start it's so easy predict what's gonna happen next, altho for the ending i can't predict what's gonna happen.

The story progression it's remained me of A Love to Kill or That Winter, The Wind Blows :v
So heavy and so drama-tic XD

BTW, i'm a video-grapher and i can tell you that there's so many mistake in the video XD
well... what u expect from the 2000's drama, right?