Eun-Seol, who had wandered the battlefield living as a juvenile soldier, sets foot in the family as the daughter-in-law of Baek Empire's Imperial General, Ki Hae-Woon. No one expected to learn the truth that Baekwoon, the eldest son of Haewoon, has already become married. In addition, Hae-Woon declares that he will make her unborn child, who also doesn't exist yet, as the successor. And on a bright moonlit night, he came to visit her place!