Our Child, Dae-han

In a 21st-century Korean Empire where absolute monarchy still exists, the royal family secretly hides the existence of a princess after the crown prince and his wife are murdered. Thirteen years later, an ordinary high school student, Hyunwoo, meets a transfer student named Doyoung who claims to be that hidden princess. As questions arise about her true identity, the truth behind the throne begins to unfold—entangling the imperial family, a resistance movement, and a concealed heir.

(Source: Naver, translated)