After the success of Mishil, Gim published Farewell Forever and Ever, Farewell Forever (Yeongyeong ibyeol yeong ibyeol) about the fate of Princess Jeongsun, wife of the ill-fated King Danjong who ascended the throne at the age of twelve, but whose power was stolen from him by his uncle, leading to the boy king’s tragic death.
He was related to Queen Jeongsun, the second wife of King Yeongjo, and by his adoptive mother, Nam Yang-hong, he was a cousin to Namyeon-gun Yi Gu, who was destined to be the grandfather of King Gojong (高宗, later titled 光武帝 Gwangmu Emperor. 1852–1919).