… Once

upon a time…

A girl named Lee Ephline, whom works for the Britisch Empire's secret agency, is send to Korea for a mission.

There are threats inside the Korean kingdom, which can cause serious damange for the noble family.

But her mission is becoming more complicated after meeting the ert and the gentle prince of Korea.

Will she be able to complete her mission?

...Let met take you back; to the time when Korea still served for their king...