Thief's Pen: The Cold Beauty of the Black Master.

Summary

The story follows Yu Yin and the Black Bear traveling by train and plane, with Yu Yin experiencing vision problems and weakness from previous laboratory experiments. During their train journey, they encounter a suspicious blonde, blue-eyed man whom they pretend to be a couple to deflect attention. They later travel to a new city, buy supplies, and board a flight. Yu Yin senses a potential threat from someone in a black trench coat, but the Black Bear remains calm and dismissive. Their journey is characterized by caution, intimacy, and a sense of underlying mystery and potential danger.

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