Lu Yan

He is the Second Household Manager of the Confucian School, a very gentle and calm man who never shows off his abilities. He is very respectful to his senior and helps Zhang Liang a lot by dealing with his aftermath and covering his secrets. According to himself, "The Eldest Senior's words must never be forgotten, the Third Junior's words must never be remembered." At present he works with Zhang Liang by helping the Mohists.

(Source: Wikipedia)