Perhaps leaving a review after 6 years, when everything has already been said by other people, is meaningless, but my head is full of contradicting thoughts right now, and there's no real place to express them.

The cast was chosen perfectly, the music was spectacular, because I'm a sucker for classical music. The plot...
Art isn't something that everyone can do, and we know it. My future profession is politics, and perhaps I'll have to deceive myself and my commitments, become coldhearted and kinda deprived of the chance to express my true feelings.
The psychology of art is a subject of extensive studies, and it goes without saying that art and emotion are homogenous in some way. A true piece of art can be born only when you lay bare your true feelings, emotions, pain, struggles and etc. The same goes for acting.

Jae Ha is someone who loses himself every time when he gets to play a new role. His character becomes his doppleganger, that's the reason he is a well-known veteran actor. He is devoted to his job, consequently he doesn't bare tardiness and slothfulness from his partners.
Young Woo is exhaused. Girls running around him trying to take a pic or touch him is a usual part of his life and perhaps he was tired of doing the same thing every day. Acting is something that helps a lot in recognizing yourself better, finding our your limits, so he wanted to try something new. I bet he could never know that he would get deeply infatuated with the veteran actor, who himself, despite his age and experience, never knew he could ever fall in love with his acting partner, because his method of acting had never let him down.

Yes, as far as I'm concerned he had feelings for Young Woo, albeit he couldn't accept them till the end. The inner battle he was going through was obvious - him running every day as fast as he can to drop those thoughts out of his head, being startled and speechless after every physical contact he made with Young Woo (the photoshoot, for example, which wasn't a part of the play). During the play he kissed Young Woo and also wasn't a part of it. That was something that he wanted himself.

Young Woo felt like he had been toyed with, because he truly believed that there was something between them. The reason he could perfectly execute his role is that he loved Jae Ha the way Singer loved Walter: madly, deeply, passionately. In the end of the performance he indeed tried to commit suicide,

But the age gap says it all. Being a young man who wants to explore the world and open himself up to new things and a middle aged man who understands the laws of attraction. It's comprehensible why Young Woo was ready to tell everyone about his, their feelings (my feelings, our feelings): he is young, vigorous, ready to overcome obstacles, because is there anything impossible when you're young?
Jae Ha is a middle aged man who can foresee the consequenses of jumping the gun and sacrificing everything. Let's take into account that homosexuality isn't something widely accepted in Korea.
At the same time, I can't deny the fact that he had feelings for Young Woo. When the latter told him that he was ready to tell everyone, he just held his face in his hands and that moment I felt his rue. During the play we could notice the thin line between the play and reality: he mixed up the names, forgot what was a part of a play and what was not. That's why, in the end, Young Woo is the perfect Singer and Jae Ha is just Walter.

I don't believe that there's a happy ending for them despite the open ending which lets us interpret it ourselves. They will go their separate ways but there's no doubt that they left an unerasable trace in each others lives.

I know that my review is as messy as the plot of "Unchain" but that's what it is. Actually, there are more thoughts invading my head right now, but I can't put them in words. This was breathtaking, compelling, and definetly not for everyone due to it's intrication.