Ermm the blood would stain something else and might be really hard to completely clean and might leave traces of blood all over the sink/tub/etc, plus he’s hopefully not planning on using the gun again so it was probably to reduce the amount of surfaces the gun will come into contact with. Also, civilians owning a gun is illegal in Korea so wiping the blood might leave gunpowder traces on the surface as well. So even if the gun is clean, he would still be arrested for gun owner ship and it would likely still tie him back to the (gun-related) murder (because of how little civilians own guns in Korea)
Damn
Like I’m pretty sure, like if we assumed that he used a handkerchief to wipe the gun, it would be stained with blood and if he washes it in the sink, the silk would also come into contact with blood which then will leave evidence if the police check. I guess an easy counter to this would be to use bleach but idk what he uses to wash his clothes and it would still leave unnecessary traces of his involvement if, he’s a suspect and he’s found to be buying bleach around the murder. Overall I don’t think it matters if he wiped the blood or not because: one, gun ownership is illegal. Two, it would tie him to the murder through mr cha (he’s involved w mr cha, and if the police find a clean gun in a house where the suspect is staying, and the house belongs to the suspect of Mr cha’s close friend(?) then it still frames him)
Anyways I’m sure the author might explain a reason for this, but I think it’ll be fine bc the gun is locked up in a safe and they’re in the middle of nowhere
Or... he could've just burned it ╮(￣▽￣)╭ And if the gun is illegal, his name must have no ties in means of ownership, clearing his fingerprints, he could throw it anywhere
Maybe he doesn’t own an incinerator, and a public incinerator would’ve caught him on cctv (since there’s cctvs everywhere in SK), and if he tried to burn it somewhere far from society, it would be in the countryside where there’s a lot of nature and a bunch of smoke or forest fire (when SK is known for being super humid,) would be suspicious and he still might be tracked. Also, even if his name has no ties, since there’s not a lot of people who bring firearms/illegally get firearms in Korea, he would still be easily tracked down (say, a gun seller would remember 50 people better than 500 people a year, if police decide to investigate deeply into the seller, which they will bc gun ownership is super serious in SK)
I mean, detectives still find evidence through ashes
But actually why would you not wipe off the gun after using it??? Especially if there's blood on it??