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Character:

Lau is a Chinese noble, President of the British Branch of a Chinese trading company, and friend to the Phantomhive family. He is also part of the Shanghai Mafia and runs an opium den. He is always smiling and his eyes are always closed except for brief moments in episodes fifteen and twenty. Lau often agrees to things before learning what is happening and jumps into conversations with helpful information only to later state he has no idea. He is also unaware his antics appear strange to others.

Source from Wikipeida