Eoreumgunju

Seol Moo-dok, a master of Hyeon-gyeong who became the lord of the North Sea Ice Palace at the age of four, was in a state of sorrow after his lover died. He realized that his dead lover was reincarnated through the legendary flower, Yeonri-hwa, and wandered around until he fell into another world...
(Source: Naver, translated)
Note: Includes one extra chapter.