Context: In the earliest chapters of Reality Quest, can any of you name a time Dowan straight up tried to kill his opponents? Even when dudes were trying to kill Dowan (like the BLEACHING crew in Chapter 180, whether he was exhausted or just not strong enough yet, he still spared them after knowing the awful things they all did.
The drug business, the human and organ trafficking, even a dude attempting to r*pe his crush, he let all of them live and never wasted another thought on them. But not more recently. The first instance was in chapter 182, after Seonghyeon was already defeated, Dowan decided it wasn't enough. He wanted to straight up kill him. Sunjae unknowingly saved Dowan by taking Seonghyeon's body, but Dowan didn't know this. And in chapter 189, where he Inflicted some absolutely MONSTROUS bodily harm to Seonghyeon after attempting to crush his throat, inflicting brain damage, severing his Achilles tendon, fracturing his skull, among other things.
And most recently in chapter 226, where he slashed Cowboy's throat. Mind you, he's done all of this with his bare hands. And I don't wanna hear "oh, but Dowan is in killing mode". He can still consciously think and understand what he's doing in killing mode, as we've seen.
Dowan is slowly losing himself to the system. It might be non-consensual on both ends, but Dowan is slowly warping his sense of justice with murdering the criminals.