
Spoiler…
They got together twice at that. If i remember correctly, before YH was expelled and both memories wiped, QJ had already had his memory wiped another time before that. The timeline is like this: QJ meets YH as examinee -> love -> QJ got out and memory wiped (YH kept memory)-> QJ got back as examiner so both as examiners -> love -> accident where both got memory wiped and YH got out -> now, where YH is in as an examinee. YH is also not an ordinary examiner, he was part of the exam from the beginning. Literally. The system uses his eyes to see and learn so that’s why he’s special to the system. He is one of the two, with Chu Yue (or Z at that time) being the other counterpart but she was punished to the rest stop. QJ is part of a military force that is trying to stop the system, he is not the only one with several making it inside so that they can break it from the inside as the system starts to go haywire. 922 is also part of them. But, as they start being examiners, the system messes with all their memories so that they don’t remember their missions anymore. 154 is a separate program within the system that was created as a restraint/self-destructing sequence but didn’t work probably so it created an ego as an examiner to stop the system. The system was created to screen military people but one of the developer at the time wanted immortality or something and messed it up. In the end the system gained a mind of its own and started going haywire. I think that’s the general gist of it. They’re soulmates yo. That’s why the system was so sensitive to them sharing a room as having an inappropriate/intimate relationship as examiner and examinee since they have a record lol. That rule was created because of them. Btw the system isn’t really teleporting them to places, they’re all in a coma right now. Though, i think deaths here are brain deaths.

What do you mean new comers? After the system went haywire, the project was shutdown/abandoned. (Meaning it wasn't used anymore) however since it went haywire, it still dragged people into the system. (Researches couldn't control this, like "Nah nah" said: the system literally had a mind of its own) So basically those who take part in the examinations aren't doing it by will, they were dragged. With the exception of the D-to-D squad, also sorry I didn't reply to your comment earlier , the explanation is sooooo long and I've already explained it lots of times in previous comments, and"Nah Nah" explained it for me so alls good (⌒▽⌒)

Yes, 154 said if they die in examination, they did in real life. But I'm guessing this isn't always the case (?) since at the very end of the novel, there were some characters that died but were shown or well, described; to continue living their normal lives however they don't remember anything from or about the system.
ok so i havent finished catching up with the chapters but is there like any romance in the recent chapters? its tagged romance but DANG its moving slow lol, im just curious ╮( ̄▽ ̄)╭