So BTS are sinners. They all made deals with the devil, except Jin. Suga covers Jimin's eyes because Jimins' regretting his decision.

As much as the member try to shield Jin from their sins, he finds out and makes a deal with the devil (or kiss maybe) to let his friends go. In the end it too late, none of the boys can be saved. Jin was tricked as well.

They find out and give up. But Jimin was praying and praying this whole time for forgiveness untill his eyes bleed (Jimin has tears running down his eye when he takes off the mask. The day before his Crucifixion Jesus, went on the mountain and prayed soo long asking for forgiveness form God until his eye started to bleed).

The real "EVIL" the "BOYS" are faced with is.....

yes, Taehyung, who persuaded the boys to do this.

After, Taehyung killed his dad, he held onto Namjoon but since he was not their for Taehyung, Tae hyung gave up and made the deal to stop his pain, past emotions, thoughts, and maybe even his sister (because he guilty for killing the dad in front or her and etc. "I'm sorry, I'm sorry, I'm sorry, my sister" he's apologising and left her became the guilt was to much).

Now this part is a little tricky, but i think God cut off Taehyung's wings as punishments for doing that to the other members. But, that the demon in his body living off his pain and etc. Taehyung is still there but has a small amount of control.

It connects like..

For example, Hobi's sense of mind comes back when he see/thinks of his mom and her always giving his chocolate because he had nightmares. Hobi's nightmare became his reality after making that deal hoping for ease but just ended up with more to deal with.

cr. seoulbeats