Judo Professor Wife most likely engaged HK Branch Chief to arrange for a hitman to murder her husband (in revenge for him having an affair with Mob Boss Wife). They were too formal with each other to be lovers when Nam saw them together at the end.
Lamentably, HK Branch Chief decided to enlist Gangnam Waiter, who recommended Snakehead Myun, who in turn hired Taxi Driver Nam.
Also in Act 4, Nam visited Judo Professor Wife & told her he would avenge her husband by killing the mastermind. She must have informed HK Branch Chief offscreen about this, because the latter then hired the North Koreans who hastily rammed Nam's car & kidnapped him. But they were too petrified to finish the job, dying instead & allowing Nam to trace back to their employer.
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