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Lin Shen rubbed his throbbing temples, the dark circles under his eyes were impossible to hide under the white fluorescent lights. He had been sitting in front of this data stream monitoring screen for a full seventeen hours. He alone had emptied the American coffee pot in the tea room three times. The ice cubes had long since run out, and for the last two cups, he drank pure black liquid without ice or sugar, which was so bitter that his tongue went numb, but he couldn't suppress any sleepiness. Footsteps came from the end of the corridor, and he knew without turning around who it was—only Su Tang in the entire department wore those thin-heeled high heels, and the rhythm of her steps on the marble floor was always unhurried, like a feline patrolling its territory. Sure enough, a cup of freshly ground coffee steaming with heat was placed ten centimeters to his right, the milk foam latte art was a crooked star, which looked like it was done by the newbie mode of the coffee machine downstairs.