-Jin is dead. He's in "the evil world which I no longer want to have anything to do" which means it's not the real world. Jin is holding smeraldo, the inexistent flowers. BTS took a picture and only Jin could be seen in it, (Hyyh onstage) which means the other members aren't dead but Jin's the only one who "lives in a dead world".
Only Jin can be seen in the Polaroid.
And this too
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BTS Theory: Love Yourself
RandomThese theories are mine so they might be wrong ^^ feel free to read if you have an interest