The eldest son of the Yoon family. Hearing about Na-kyum, he seeks him out having taken an interest in his paintings. He describes himself as an impatient man and can be exceptionally violent both in his temperament and using a sword. Aware of his reputation for promiscuity, Seungho tells Na-kyum he would never embrace a peasant. Wishing for Na-kyum to create works involving himself and others, Seungho is also intimate with Jihwa. Taking a poem Na-kyum owns, Seungho tells him he can have it back when he resumes painting. His manipulation would extend to bringing someone Na-kyum knows, In-hun to his as a means of having him comply with his demands.