Absolute gems

After finding out that my boyfriend was cheating on me with my little sister, I announced our break-up in a fit of rage. But never could I have imagined that the two of them would commit double suicide. Even the police believes that this was just an accident... But I felt that things weren't that simple. Since my university days, anyone who had a conflict with me would all perish in unnatural deaths...

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"Now that I'm back, I won't allow my loved ones to die again!"
The Shadow Labyrinth - the most catastrophic existence humanity has faced in history.
Desir Arman is one of the six remaining survivors of mankind within it.
The six attempt to clear the final level of the labyrinth but ultimately fail, and the world comes to an end.
However - when Desir thought he would meet his demise, what is revealed before him is the world... thirteen years ago?!