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So my theory is that Jumin's team would give Dan a double or triple salary offer for him to switch teams, which of course he would refuse. Then his grandma dies, but Jaekyung unaware of what is going on with him lately keeps being the asshole he is to a point where Dan snaps and quits and tells him that he's accepting Jumin's team's offer.
Which marks the beginning of the fall for Jaekyung, losing his match against Jumin first and then being unable to find a suitable sex partner for his jinx...
My reasoning is as follows: that mafia thingy wanna fuck Jaekyung over and noticed the importance of Dan in his life but that doesn't mean that they'll abduct Dan... they could simply make him leave Jaekyung's side for extra emotional damage instead!