About

Protagonist: Jang Dan-bi A typical Korean high school senior and a total 'math-hater.' The entire episode begins when the King (Lee Do) misinterprets her status as a 'Gosan' (high school senior) as 'Gosam' (eunuch), exclaiming, "You're a Gosam?!" Despite her lack of deep knowledge—especially in mathematics where she only possesses the most basic skills—her abilities are highly valued in Joseon. Furthermore, utilizing her experiences from the modern world, she achieves the feat of creating a Jagyeongnu (water clock). She also brings many modern items, taking selfies with Lee Do on her phone and making use of a compass and various other tools. Lee Do The young King of Joseon. He ascended to the throne at a young age after surviving the fierce political battles of the Saganwon. He is an extreme workaholic and a competitor who hates to lose. However, despite his perfectionism, he is still a young King; his hobby is Cuju (soccer), but he can't run around freely because he has to mind his ministers' gazes. Instead, he keeps a ball in his quarters and throws it at his eunuchs every day. He has a firm dream of creating a script, and while he doesn't believe in what he can't see, he is the type who must understand the principles of everything he can see. What is a Gosam? A person whose male reproductive organs have been removed. It is a word no longer used today. However, it was used during the Joseon Dynasty; in short, a eunuch.