"Taiyō no Tō" is a historical manga series set in the early 20th century, primarily during the Japanese colonial period in Korea. The narrative centers around Lee Wan Sun, a young Korean girl who becomes involved in the independence movement against Japanese rule. After witnessing the brutal suppression of her people and the execution of her father by Japanese authorities, Wan Sun is driven by a desire for justice and freedom. She joins a secret resistance group, adopting the alias "Hina," and dedicates herself to the cause of Korean liberation.

The story unfolds through Wan Sun's journey as she navigates the complexities of espionage, betrayal, and sacrifice. Her path intersects with key historical events, such as the March 1st Movement, a pivotal protest for Korean independence. Alongside Wan Sun, the manga features a diverse cast of characters, including fellow resistance fighters, Japanese officials, and civilians caught in the crossfire of political turmoil. Notable figures include Kim San, a passionate revolutionary who becomes Wan Sun's mentor, and Takeda, a conflicted Japanese officer grappling with his loyalty to the empire and his growing empathy for the Korean people.

The plot delves into the moral ambiguities of war and resistance, exploring themes of identity, loyalty, and the cost of freedom. Wan Sun's character evolves from a grieving daughter to a determined revolutionary, embodying the resilience and spirit of the Korean independence movement. The manga meticulously portrays the historical context, blending real events with fictionalized accounts to create a compelling narrative. Through its portrayal of personal and collective struggles, "Taiyō no Tō" offers a nuanced perspective on a turbulent period in East Asian history.