Bruh, I was shaking in my room..

So this happens 52-57
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I don't understand Korean, but what was happening was pretty damn clear.
So, bday party and all. Lots friends to celebrate beeboy's birthday. However, it dawned to me. People were getting lesser and lesser by the frame

By then, the scene shows up where one friend was trying to to get it the black room. It was locked so, he decided to just leave. But then, he picked up a slightly bloody phone on the floor. Turning around, he saw the black opening.

Next scene...
Birthday boy went up to the second floor. Finally, he opened the fricking door that he's been so hesitant to open for so long. In between, scenes of their childhood pop up.
Anyway, it kind of spooked him because he suddenly saw a full body length mirror reflecting his silhouette with a freaky smile and another silhouette behind it. For me, I thought it was not a room but a huge mirror that was only hidden behind that black door

Reality is that it was a room filled with different sorts of mirror with this old type of TV in the middle.
B-boy going inside exploring, seme appears. They talk for a bit. And as expected, they be making out. And then of course, they're f**king each other so desperately. In the midst of their hot sex and all, all mirrors were showing what was really in that room. The mirrors were showcasing the carcasses of B-boy's friends, decapitated heads, severed limbs, and even bones sticking out.

By the end, there are five left-- four friends and the uncle.