To the east of Cheonghae Lake, the mountain that directly blocks the way between Seonyeong and Cheonghae Lake is Ilwol Mountain.

Long, long ago, when the Tohun Empire was in its grand era, it is said that Princess Munseong of the Tang Dynasty was sold as tribute to Tohun.

Meanwhile, Princess Munseong cherished a precious mirror inherited from her mother, engraved with the sun and moon. However, while feeling sad about being sold to a barbarian, she broke it. The reason why she broke the poor mirror remains unknown, but this mirror became known as Ilwol Mirror, and thus the …