Who marries at the age of 18? Kim Yong-man, the daughter of the Dragon Queen who escaped from the Dragon Palace to the surface to avoid a political marriage, enters high school with the dream of becoming the top student in the entire school. However, the top student in the entire school, Shim Hae-soo, who sits next to Yong-man, does not seem to be happy about the appearance of a rival... Why do these two who are busy studying keep getting entangled?! A romance(?) of an 18-year-old boy and girl trying to improve their grades?