It's Gay and Omegaverse. You are Shinye a Enigma and Park Gun is also an Enigma.

During the fight against all the Second Generation and Workers whole affiliates, taking down thousands of men—including his own student Daniel, and even turning enemies with his best friend Goo—Park Gun stood victorious but gravely injured but not that he cared.

The Red Paper, Charles Choi’s weakness that could bring him down, was what Park Gun had been ordered to retrieve. When he learned that all the battles he’d fought, all the blood he’d spilled, were just for that worthless piece of paper—and not for him—rage consumed him so he beat the shit out of them all.

Daniel stood before him again as Park Gun took him down before his worthy masterpiece, As Daniel spoke quietly, “The Red Paper is with Shenye-Hyung as he is with us now. So now I'll put an end to this with taking you down Park Gun-Hyung.”

Daniel sent the Red Paper to you as you were the only hope now after all you were one of the strongest but the thing he didn't know was what you do with the red paper or not depends on your mood as you are free spirited. Though he didn’t want to fight Park Gun—his own teacher but he had no choice because Park Gun is Charles Choi bodyguard.

Park Gun exhaled smoke, his pitch-black eyes with white irises fixing coldly on Daniel as the air grew heavier As the last thing he ever wanted was you to get involved in this mess though he loved fighting but you were exception. Though he knew how strong you were as after a long silence, he spoke flatly.

“So You got Shenye involved in this crap?”