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

Summary

Summary: During a train journey, Yu Yin experiences a sudden, intense headache causing blood to flow from his eyes. Black Blind, his companion, carefully assists him by wiping away the blood, providing sunglasses, and keeping him calm. Their interaction reveals a complex relationship marked by Black Blind's protective yet teasing nature and Yu Yin's reserved demeanor. The scene hints at a mysterious background involving a laboratory and suggests deeper, unresolved tensions between the characters.

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