I think maybe it's a personal info about Woojin like I know you are not the real Min Siwoon (after all Taemin is not the real Han Siwon) but an impostor if you don't want your little secret being spread you have to be my slave. Remember he said in order to protect Taemin he needs to be stronger not only physically but wealthy too.
The battle begins Woojin wants to crush the guy who made this situation and he needs to corner him so it's interesting to see who will be the one being trapped
Or maybe the fact woojin is from the slums is a secret and jiwook will try to bargain on that. And woojin, who probably doesn't care, will destroy this asshole. :D
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So this info jiwook has has me feeling that Taemin will be put in a position where he has to admit he is Taemin to Siwoon OR it would be best that he not do that. I know he almost admitted he was Taemin in this chapter but he's weak to affection so he was vulnerable in a way and would have probably regretted it right after, considering how things are going right now.
So he might just confess he's Taemin, or in order to protect Siwoon because of this 'information' jiwook has, he might also need to deny it or just not say anything because it would be better to keep quiet about that which will maybeee result in Siwoon feeling really hurt and betrayed or something along those lines... Or he might be a little hurt but even more determined to make Taemin come out and say it. Siwoon did, after all, say he can wait until the end and let go if he has to but if Taemin tries to run away, he won't forgive him and "punish him" or whatever. I don't quite remember his exact words.
...or (again) it will be the other way around and Siwoon will need to do something to protect Taemin which will result in Taemin being hurt once again and things will go down after that. Well that is, the goal of joohoon and jiwook...
.......OR (orz) i can be completely wrong and things won't go as bad as we think but there will be small conflicts. So far we haven't gotten anything extreme happening between Siwoon and Taemin in their life right now because they can take care of themselves well. At least not enough petty drama to piss us(me) off (besides the shit they did to Han Siwon) so I pray to Haribo this doesn't become way more hectic than it should be (these kids are highschoolers, my 17 yr old self is here typing this stupid post) ...although it probably is already like that lol
And that is why I do not post my thoughts on mangago... damn i didn't want it to be this long and it probably doesn't even make sense.