Yi "Hong, Crimson Moon, Jin Yeon" Hwi

About

Yi Hwi is the 18-year-old prince of Gaguk, and arguably the rightful emperor to the throne, driven from the palace as a child by assasins. He is now the leader of the rebels against the government known across the country as Crimson Moon, though his true identity is a secret to only a few who know him. By day, he lives his life as Nabi, a gisaeng (female entertainer). He is also a highly valued painter, with his rare paintings costing a hefty sum to those who buy them, though even here his identity remains unknown.

(Source: Twelve Nights Wiki)