SPOILERS vvvvvvv
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To start off, they are going into a dungeon when someone tries to interfere. The Newcommer pulls them all out in time, and puts everyone into a virtual reality based dungeon thing that he made for Yoojin. But Yoojin wasn't put under like the others due to the mama stones near his heart, which leads to this situation:
"...they all seemed like they’d just fallen asleep. Their coloring was unchanged, and they were breathing well enough too.
And Sung Hyunjae, too.
“…how unfamiliar.”
Seeing him stretched out in sleep felt awkward. He was actually unconscious, right?
“Look here, Seseung’s Guild Leader-nim.”
I furtively tapped the side of his face, but he didn’t so much as twitch. He really was irritatingly good looking. Even when I pinched his cheek and pulled on it, he didn’t move at all.
“Oi, Hyunjae-ssi, Hyunjae hyung, Hyunjae-yah, Hyunjae bastard.”
It really did look like he was out cold."
So he gets put into the dungeon using his real body, and he has to find the others. The first of his Companions he comes across is Sung Hyunjae... or is it? It's a guy that looks like and has the same skills as him, but Sung's memories aren't there. The persons name is "Sigma" (Yeah ik). Hes an SS class Guard that protects the city. And just like with Sung, Yoojin manages to catch his interest.
Turns out later that Sigma was supposed to be Sung, but Sung infiltrated the System (I think?) So he does turn put to be Sigma, but it wasn't Sung at the time, it was the actual Sigma.
It's kinda hard to explain some of the important parts though so that's all you get!
If you guys are going crazy other this, just wait till the Virtual Dungeon Arc (ФωФ)