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I think JS got a bit desperate, because he just learned that Nok will die, and it will probably be connected to the current situations (the queen, and his servant dying), so he wants to keep him as far from the happenings as possible, but at the same time he has the communication skills of a vermin ghost (as Nok called him lol). And he is probably torn between wanting to keep him alive and wanting to see him die.
Also he probably got desperate to learn that if Nok dies without falling in love, Jaeshin will need to stay in the human world trying to find a new human to fall in love with. So he got torn between wanting to get the confession from him as soon as possible, but at the same time trying ti distance himself from Nok. And that caused this weird conversation and angry reaction