my bet? --> All Jae thinks about is winning the next match, but we can't say for sure anything about what the reaction to the photos will be like. He can have two interpretations good or bad, good could be a spy Junmin like you said and bad he believes that Dan is working as a spy, he will accuse Dan of being money hungry since between them he asked for a lot of money and now wants more...
I would honestly be surprised if it took any other plot path.
honestly with how jaekyung has muscles for brain i wouldn't be surprised if he takes his anger out on dan. either that or jk is going to find some new partner for his jinx and fire dan idk (if it goes that way then we'll probably see the jinx not working anymore or some shit, and jaekyung will get his ass beaten by junmin)
hear me out
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if jaekyung had any brain cells at all left in that thick skull of his, he would tell dan to accept the offer and then spy on junmin. of course, he'd probably pull the leash back after the match and keep dan trapped with him. but i feel like jaekyung has exactly 2 brain cells: 1 for being violent and 1 for being horny. so no room for logic or planning