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

Summary

In the early morning, Yu Yin awakens to find Black Blind holding his hand, having spent the night by his side. He discovers a letter from his deceased mother, revealing her regrets and urging him to investigate laboratories linked to a cruel organization seeking immortality. The letter contains locations of these labs and an address in Beijing with items left for him. Yu Yin, filled with confusion and sorrow, expresses a desire to learn to read. After a long journey, they arrive in Beijing, where Black Blind seeks local help to find the mysterious address, leading them to an abandoned building with unknown significance.

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