tbh that's not what I thought you meant by seventeen poster
i was going to be like go to ebay or something xD

I see it now! And yeah they are both Minghao and Junhui^^

Oh, tae, I can tell you an easy way to double-check any photo to see who's in it:

1) go to Google Images.
2) See the little camera icon in the search bar? Click on that. That allows you to do a reverse image search.
3) Now you can either paste the URL of the pic in question or just upload the pic. So, if the pic is already online, just paste the link. Like, the pic you have here in the blog on the left (http://data.whicdn.com/images/180567219/large.jpg). Copy/paste that link in the search bar.
4) Now it will bring you to a Google results page that will tell you to the best of Google's knowledge (haha) who is in the pic. So you see it says "seventeen jun blonde").

Also helpful is that, if you look right by the pic on that results page, you'll see that it says "Find other sizes of this image." I USE THAT ALL THE TIME omg because you know requesters always give tiny low-quality pics... but if you do a reverse image search, you can usually find a larger size.

Something else cool about this: there's the "visually similar images" that you can look through, which sometimes can give you that same character like from the same photoshoot or something.

Anyway, I learned this a long time ago because requesters would keep giving me pics of ulzzangs and the pics were terrible but I didn't know who the ulzzang was so I couldn't search for another pic... until I figured out this reverse image search to find out who she is and then search for other pics of that ulzzang after using her name.

BTW the pic of Jun is of him^^

I can't see the pic for The8 :P I can help you though Tae^^