Thanks! so you read Korean, too?
-People are looking at the news and are reacting differently depending on whether they can see the demon or not and whether they know what demons are or not...
Reconsidering it, maybe the main purpose of this attack is to let more people know the existence of demon
Yukio: "If you're not gonna tell me, I'm not gonna tell you". Lightning: "You want to know (about other people's information), but you don't want them to know (about your information). You're quite the egoist one." Yukio: "Compared to you, I lose in that regard." meaning "you're more egoist than me" in case it's not clear. Lightning: "It might seems so, but that's not the case. I'm a real humanist." Memory of Ryuuji during the phone call: "To go this far, he must have a reason. If I tell him, maybe I can save/help him..."
So Bon did tell others and Yukio expects it. I wonder if Yukio had any plan for subsequent steps, or is he just mad and abandon rational thoughts? Lightning is unexpectedly nice to him. It seems like he also wants Yukio to be on his side.
You're keeping watch on Yukio, right?" Renzou: "Even if you ask me... (I can't tell you) Anyway, could you please take off that bell. I do spying for the order too you know." Lightning: "Alright." Renzou: "Really?" Lightning: "But in exchange, I have something I want you to do."
... another unknown info.
I think Renzou is following Yukio, but I am a little surprised he can't even admit that to Lightning.
-Later at the dorm. Ryuuji talks to himself and says "What the hell did he do, this guy..."
Maybe what Lightning gave Yukio is the same as the documents Bon is reading?
-In the train, Rin tells Ryuuji "having it hard, hun? (crouching in a train alley to work on your computer)".
Though that reminds Ryuuji of what happened with Yukio, and he tells Rin he has something he needs to talk with him about, but not now since he has work to do, so he asks him if he's free tomorrow. Rin replies "Sure".
I'm gonna call it now:
the next day, Rin: "So, what did you want to tell me?" Suguro: "Oh, it's nothing. Forget it."
Usually in the manga it means something is going to happen tomorrow before Bon tells Rin, so I believe Bon does mean he will tell Rin, although at that time he probably doesn't need anymore.
I'm a little bothered what's so urgent in Bon's laptop that he doesn't have time to simply say "Something is wrong about your brother, you should be with him.". And it looks like Rin actually was asking Bon what he is busy doing.
-When it starts snowing, Rin thinks about Yukio and says he wonders if he has something warm to eat.
... and here my heart melts 
I'm also a little bothered why Rin still goes home even though he is deeply worrying about Yukio.
-At the end of the chapter it says "The time to learn everything has come"
And Yukio thinks "This is..."
(Given that last line, I'll be surprised if they don't show us what's on that key next chapter.)
Considering Kato's style (60+ chapters and we still don't know what the hell Yukio's eyes are about), I won't be surprised if we don't get to know what's in that usb for like 60+ more chapters.
A large part of the manga is from Yukio's perspective, so I think we will always have the same knowledge as Yukio.
But maybe that's only my hope...