Jake was never truly a gangster, he was handling an undercover mission as, like you said, he’s an agent for a ‘secret service’ (essentially the cia). The reason why shin is interfering with Jake’s work is simply, he has nothing to lose and wants to help the man he loves, he’s basically just ride or die. Their dynamic is more intense now, they sort of rely on each other a lot more since they’re more serious about their relationship. Hopefully that covered all your questions :)

Hi sorry to bother but i read this so much time ago that I'm lost in the plot and I don't have the time now to reread. Can someone to me what happened? I thought he was a gangster, turns out he is like part of the cia(?) And I don't understand the current dynamic between mc and ml. Why did mc interfere with ml work?