Ok here's my interpretation upon watching this MV for several times. I believe that the ‘king-Junsu’ who sits on the throne represents SM (or SM's leaders) with great power and superior status. He’s surrounded by dancers (0:57) wearing fancy stage outfits who may represent the current idols in SM.The savage-looking group of men represent the former idols who have been banished from SM (the all-mighty dream-fulfilling temple viewed by the naive public). They, including the JYJ members, were viewed by the public as the ‘wrong’ ‘guilty’ ones, the ungrateful traitors. SM forced ugly masks on them and sealed their mouths 0:37, silencing them while making up lies to ruin their reputation, ruin their lives. And just before they leave, they throw the gold robot head on the ground 0:46. This head may represent Junsu’s past life as an SM idol who appears to be covered by fame and fortune (gold) but inside is more like a machine/robot. Now this machine is broken, this idol life is destroyed and gone. At 1:16, the gold head on the ground shakes its mouth while the song goes "all the dreams are crashed between the lips" (sorry if my translation’s not spot-on). An angry masked man shouts something to the king while the lyric goes “lies can’t kill the truth” 0:52..After this big amount of symbolism at the beginning, Junsu sings “take me out from those rotten memories” 1:22, again meaning that the first part is a recall of his past history with SM.
Then there goes this interesting little girl (1:55) who, I think, represents truth, goodness and justice. She's looking at ‘king-Junsu’ (SM) and what he's doing but stays silent (for now). King-Junsu stares back at her and tilts his head, not knowing who she is, what she’s thinking or what she’ll do to him, which he will find out one day. At 2:05, the broken robot head sinks down a pool of liquid and goes into some kind of a factory 2:08 which extracts gold coffee 2:17 from it to be drunk by king-Junsu (SM) . This can relate to how SM not only exploited Junsu and other former idols when they were in the company, but endlessly sue them and do all other kinds of things to extract every last drop of benefit and profit from them, even after their idol lives are already ruined. Meanwhile the song goes ‘the cruelly trampled flower...the countless scars that imprison me…’The 2:55 part where ‘savage-Junsu’ dances in the dark forest may represent that for a long time, he was exiled from SM and deeply wounded, struggling to recover, to not be judged as the villain, to regain his career and basically to rise above and bloom into a ‘flower’. The lyrics at 3.28 go “you become the world’s hot topic and turn to ashes, they take every piece of you like meat”, while king-Junsu is eating a dish of raw fish meat (the destroyed Junsu in real life). The MV’s last part is where the table turns, as Junsu sings “your life your soul your world, they cannot kill it. I died and reborn, I killed it”, etc. These lyrics and the whole song may also be a shout-out to encourage the SM idols (like EXO, SNSD, f(x) and more) who currently face so many hardships.Junsu becomes a golden warrior at 3:37, as the song goes ‘the darkness swallowed me but now I’m swallowing you’. Then the little girl shows up again 3:41, laughing as king-Junsu falls sick from eating the fish (maybe after he’s eaten too many of them for years and years...) and collapses to the ground. The time has finally come for her to witness truth and justice being restored, and the cruel king being punished.