DeathKin

It's in templetoons in case you wanna read ahead, mangago uploads are like way behind at the moment orz
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Lister is such a bastard. Even way back then when he was serving under Slan. He's the epitome of boys tugging a girl's hair cuz he has a crush on them

Finally found some spoilers for the whole story. It came from a comment in templetoons (the site originally translating this manhwa series, currently chapter 41 as of the moment)

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'East Kalak' is a thousand-year-old natural fortress, surrounded on all sides. It is a harsh place where sandstorms in winter leave you trapped.

For a thousand years, they believed that the Great Canyon in the East would protect 'Kalak', but Slann had a plan to build a bridge across the Great Canyon to open 'Eastern Kalak' and create an abundant 'Kalak' by interacting with the rich south. (Chapter 14)

Slan lost his comrades who shared that dream three years ago, and on the night everything happened, Slan went out to fight, and even sent Ismion to Lyod telling him that he was okay.

Slan went to meet the knights and the general. The general entered the Kalak castle with his private soldiers, and Lister of Glendberg, who was guarding the castle this day, turned a blind eye to it.

His aunt, Princess Helen, and the General joined hands to poison Slann, kill his father and mother, and even kill his uncle, Prince Kalak.

After drinking poison and becoming mad, he made Slan a slave who lost his wits... After all this happened, six days later, Lyod who had been besieging Kalak Castle, was able to enter, but he met Princess Helen, Slan's aunt, and found out that she had planned the whole conspiracy.

When Lyod asked to save Slan's life, who has lost his wits and does not recognize himself, Slan's aunt cites the old Kalak saying, "A life for a life..." and demand that he cut off Slan's arm, saying, "For a knight, the left arm is more important than his life."

Lyod cut off his arm without a second of hesitation.

Seeing Slan naked and imprisoned in Helga's Tower, Lisbeth told Lyod that she would take care of Slann and find a cure, and told him to go and resolve the Alto Civil War in the Northwest that had been an headache for 20 years.

Ismion knew that as knight, Lyod, losing his left arm was like losing his life, so he gave him the arm of a demon.

Lisbeth, knowing that her younger brother Lister, a knight of the royal court, had turned a blind eye to the General bringing in his private army, buried Lister's story for the sake of her family and kept it a secret.

After spending hellish days, Lyod returned and finally met Slan in the ruined corridor...

Slan regained his memories by taking the medicine given to him by Ismion, and begins a war to reclaim the city of Kalak.

Lister, who came to find Slan on the battlefield and asked him to return to Glenberg. Lister said he loves him.

After hearing Lister's confession that he had betrayed, abused, insulted, and made him miserable, Slann is furious, wondering if all of this can be forgiven simply by saying that he loved him.

Lyold, who appeared through the coin that Slan flipped, kills Lister, and Slann asks Ismion to make a poison similar to the one that caused his madness, and he poisons his aunt who is sitting on the throne, then drags her to the 'Tower of Helga' where she dropped him and his mother, killed her and pushes her to death.

Lyord is carrying out a large-scale purge.

Slann is busy cleaning up the aftermath of the war...

kiss, the burning sword, the bridge of Mannerheim, the esophagus-burning poison, the desolate land and the sandstorm, the overflowing waters of the Kövisto River, all these things melted together and became tangled, so that nothing mattered.