Lahan is the adoptive son and biological nephew of Lakan and the adoptive brother and biological cousin of Maomao. He is a secondary character in Kusuriya no Hitorigoto.

He looks like the male version of Maomao and has fox eyes.

Cunning and perceptive like the rest of his family, Lahan is a miser who is particularly good with numbers and finances and runs several businesses. Unlike his adoptive father, he is a reasonable person who can handle social situations; like his adoptive father, he can't handle alcohol at all.