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Wooyeon tries to be nice to Inseop but he doesn't understand his own emotions since he has antisocial personality disorder.
Along the way he will hurt Inseop a lot, but there will be also warm moments that will help Inseop to realize he actually follow Wooyeon by his own will (and not because the so called revenge).
The novel is so long, and in the future Wooyeon actually regret the things he did.
Spoiler
They get married in the novel, after many years of relationship