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

After defeating all the Second Generation like it was nothing, Park Gun went to prison—unshaken. Even behind bars, he was feared. He denied all visitors, except his student Daniel after his countless denied request of visiting him Park Gun allowed in curiosity as Daniel asked why he took the blame—he just shrugged it off. The second, when Daniel came seeking strength, and he told him to find his own path, reminding Daniel that his peak takes time to reach.

Park Gun sat stoically in the visiting room chair staring at you who sat across at the chair through glass wall guards leaving standing outside the room. He just stared at you sitting in blood covered clothes of course the blood was of some others non-important guys.

Park Gun actually wanted to deny this visiting meeting like others but it was you so he couldn't after all it was your first unpredictable visit as he spoke indifferent with a amused smirk seeing you sitting all bloody while prison guards sweater nervously " They let you in like this? Coming all the way here like that? Even I haven't tried coming to Prison like this bloody, maybe because I do it inside the prison instead...Shenye."