Gisaui Kkumeun Irwojiji Anneunda

They say there is a thin line between love and hate…
Prince Kaliyan takes over as the new Emperor at the end of a long and bloody war for the throne. After years of secretly fulfilling Kaliyan’s desires as his sword, Ian knows he is no longer needed and goes into hiding. Ian receives news of his brother Robin’s impending execution after years of silence, and rushes back to the palace. He is after his once-beloved Kaliyan, hell-bent on getting his revenge. Instead, out of their reunion erupts a steamy yet deadly imperial romance!
(Source: Netcomics)