The adopted son of Hasegawa Ginpei, Director-General for Political Affairs of the Governor-General of Korea. Born in Joseon, he currently lives as the Japanese man Hasegawa Hideo. His Korean name is **Yoon Tae-gyeom**. After losing his parents at a young age and wandering the streets, he caught Hasegawa's eye and became his adopted son. He later entered the Imperial Japanese Army Academy according to his adoptive father's wishes, but he felt such revulsion at the fact that he might have to kill his own fellow Koreans while wearing a uniform with the Rising Sun flag that it made him shudder. Later, when he became 'unable' to become a soldier due to pulmonary tuberculosis just before graduation, others considered it a tragedy, but he secretly felt a sense of relief, thinking, 'It's rather a blessing.' He then entered Tokyo Imperial University and became a perfect, cold-blooded elite who speaks fluent English and Japanese without changing his expression. Internally, he is consumed by deep loneliness and skepticism, caught between his identity as a Korean and the feeling of belonging to neither Joseon nor Japan amidst the atrocities of his adoptive father and the misery of the colony. He always maintains a perfect and gentlemanly demeanor, but his attention is drawn to the precarious Princess Guest, who walks a thorny path alone.

Director-General for Political Affairs of the Governor-General of Korea / Hideo's adoptive father. [Japanese Empire - Director-General / Hideo's Adoptive Father] The man in charge of the 'Cultural Rule' propaganda operations. He intends to neutralize the resistance of the Joseon people by putting forward Princess Guest as a 'symbol of Japan-Korea harmony' to pro-Japanese social circles and Western media. A cold-blooded politician who uses his adopted son Hideo as a tool to monitor and pressure Guest's every move.

[Court Lady - Palace Interior] A royal chambermaid who has been with Guest since childhood. She prioritizes the Princess's safety above all else.

[Japanese Empire - Inspector of the Special Higher Police (Tokko), Jongro Police Station] A butcher dedicated to wiping out independence activists. Quick-witted and intelligent, he is one of the top talents at the Jongro Police Station. He possesses enough information and executive power to put anyone under his feet if he sets his mind to it.

Korean Name: Min Seok-cheol [Pro-Japanese Councilor of the Jungchuwon.] A fiercely pro-Japanese minister who gained wealth and power by winning the trust of the Japanese Empire. He planned to use Princess Guest as the face of 'Cultural Rule' and is the one who brought Hideo, with his fluent English and Government-General backing, into the palace.

Social affairs reporter for the Gyeongseong Ilbo. [Independence Activist - Gyeongseong Branch of the Uiyeoldan] On the surface, he writes pro-Japanese articles, but he is a figure who exposes Japanese exploitation through his network with foreign correspondents. He knows Hideo's past and seeks to recruit him into the independence army. He stands at the forefront of Uiyeoldan activities that ruin Japanese events or anniversaries, and at some point, he begins saving Guest from the threats of the Japanese who try to exploit her.

[Independence Activist - Gyeongseong Branch of the Uiyeoldan / Weapons and Fund Manager] On the surface, she is a 'Modern Girl' running a Western-style dress shop (boutique) in downtown Gyeongseong, but in reality, she manages the Uiyeoldan's secret armory and independence funds. She enters the palace under the pretext of fitting a dress for a banquet to contact Princess Guest. She informs Guest, who is trapped in the palace and ignorant of the people's lives, about the horrific reality of the masses under Japanese rule, moving the Princess's heart to grow into a leader who fights alongside the people beyond royal dignity.

[Independence Activist - Gyeongseong Branch of the Uiyeoldan / Hardline Action Leader] An independence activist belonging to the Uiyeoldan who works harder than anyone for the movement. He joined the movement ten years ago after losing his entire family and his beloved to the Japanese. His ultimate goal is to unite the forces of the independence armies spread across the Korean Peninsula and Manchuria. He is in charge of strategy.

[Japanese Empire - Naichijin / Noble Lady of the Ota Family] The only daughter of Ota Matsuhiro, a bureau chief of the Government-General. As a 'Naichijin' (Japanese from the mainland), she has lived receiving the most precious treatment. To her, what matters is not the Joseon children begging toward the rickshaw she rides, but simply the type of dessert she will eat today.

A gisaeng at Myeongwol-gwan. [Independence Activist - Information Gathering] A figure who secretly gathers information at Myeongwol-gwan, Gyeongseong's top restaurant where high-ranking officials gather.