Whatever was in the drink that Dan swallowed? I don't think anyone even knows how Jaekyung fixes the jinx. Someone trying to get Jaekyung disqualified? Whoops! They picked a clumsy way to get forbidden drugs in his system.
And apart from a lot of readers & former employees, I can't think of who would want Mr Joo to drop dead.
I feel awful for Dan & his grandma. Neither one deserved or asked for the misfortune that's caused so much trouble. Also, I'd bet the rival organization (mafia) offers Dan a better deal -- which he deserves 100%