After The Hated Character Awakens, He Cremate Everyone

Taekook AU - Kim Taehyung × Jeon Jungkook (Adaption)
Everyone hated Kim Taehyung.
In the eyes of the public, he was an arrogant celebrity, a shameless homewrecker, and the spoiled biological son of a wealthy family. Even his own family seemed to prefer his adopted brother, Kim Jihoon.
But Taehyung knew the truth.
He had spent his entire life desperately trying to earn the love and recognition that everyone else seemed to receive effortlessly.
Then, one day, Kim Jihoon pushed him off a cliff.
With no witnesses, no evidence, and no one coming to save him, Taehyung believed his life had finally come to an end.
But when he opens his eyes again, he discovers something impossible.
The world he lives in is actually a novel.
And Kim Jihoon-the beloved younger brother everyone adores-is the protagonist.
Taehyung?
He's the hated character destined to suffer, be misunderstood, and eventually die.
But this time, Taehyung knows the ending.
He refuses to follow the script.
He won't beg for his family's love.
He won't compete with Jihoon.
And he certainly won't allow himself to become the villain everyone expects him to be.
Yet just when Taehyung begins planning his new life away from everyone, he discovers that the mysterious man who rescued him from the cliff is none other than Jeon Jungkook-the cold, powerful man who was supposed to have absolutely nothing to do with him.
Jungkook was never supposed to save Taehyung.
He was never supposed to care about him.
And Taehyung was never supposed to fall in love with him.
But perhaps being reborn means more than getting a second chance at life.
Perhaps this time, the hated character gets to rewrite his own ending.