Catharsis

Affection, affinity, or even fixation of all the Male Main Characters on 'a girl
who has charm like sunrise' dissipates when their addiction is confronted
with 'a boy who has charm like sunset'.

It makes the girl free from prison of fate, but the boy who is the target of
their love is instantly shackled by fate. On the other hand, Male Lead's
suddenly questioned their feelings.

Roksu, a man from a post-apocalyptic world, finds himself trapped in a dark romance-fantasy novel. He took over the body of a wealthy but notoriously trashy noble teenager named Cale. He also had to adapt to all sorts of trouble the real Cale had put him through, not to mention he was being escorted by an Assassin and Torture Master. Not only that, he also had to deal with all of Male Leads slowly getting attracted to him while enduring the strange pull he felt on the Crossman twins.
More terrifying than all of that, he had to accept the reality of real Cale's deepest secret that no one would ever expect.

Really, he wanted to hit the back of the head culprit who threw him into such a novel world.

Original writer : kharismaura
Ao3

I'm upload this for offline reading purpose