This reminded me of a passage I recently came across in the 2015 novel "Shine the Dawn" [ 아침은 빛나라 ] by Rim Bong Ch'ŏl. Part 1 Chapter 4 follows the adventures of Ryonha Machine Tool Factory engineer Ri Jŏng and senior researcher Ahn Shi Hak as they travel to Singapore to demonstrate their new CNC technology at a trade show.
Strolling the streets one evening after dinner, Ri spotted a stall selling some sunglasses of the sort gangsters wear [깽들이 끼고다니는것과 비슷한 안경], and he bought a pair. Ahn Shi Hak's eyes widened, wondering if his companion had such proclivities.
When Ri showed up the next day wearing the glasses to an interview, Ahn fumed, saying it was inappropriate for a diplomatic venue...
It was only during Ri’s meeting with a Singaporean broker that Ahn got a vague sense for why Ri had stubbornly insisted on wearing those sunglasses. His counterpart was wearing the same kind. They were glazed like the kind a blind man wears, and gazing into them gradually one’s opponent would be overcome with anxiety. It was like stepping on the bottom of an unknown well.
To compare it to a battle, it was like one person lying down in a trench with only his gun poking out, while the opponent was up on the parapet shooting with his whole body exposed. Their counterpart, whose company had branches in various parts of Southeast Asia specializing in electronics and machinery trade, had clearly done his research on them.
The salesmen and the foreign broker get down to business. At a key moment in the negotiations, Ri whips off his sunglasses and coolly stares down his opponent. The move has the desired effect, throwing the broker off guard.
The Great Leader walked back over to the sofa where Comrade Kim Jong-il was sitting and stopped. “Take off your glasses.”"Hmm?... "Comrade Kim Jong-il hesitated for a moment and then took off his tinted lenses [연한 색안경].“Your eyes are bloodshot. You’re not in good health. You knew I’d be worried, so you put on sunglasses.”“It’s nothing.”The Great Leader could not take His loving eyes off Comrade Kim Jong-il. “It’s been ten years since you started working with the Party Central Committee…” When the Great Leader thought of Comrade Kim Jong-il working so hard to lighten His burden, dedicating so much energy to pulling the locomotive of the Party and revolution without rest, His eyes welled up with tears.