Xingyin is the secret daughter of the Moon Goddess, raised in isolation on the moon. She practices the flute and qin in her sheltered home, unaware of the broader politics of the immortal worlds until her magic inadvertently draws the attention of the Celestial Empress. Forced to flee, she conceals her true identity and works her way up from a lowly servant to a formidable archer in the Celestial Army. She remains fiercely devoted to her family and searches for a way to secure her mother's freedom.

Liwei is the heir to the Celestial Kingdom, though he privately disagrees with his parents' ruthless methods of ruling. He excels in painting, martial arts, and magic. He rescues Xingyin from a cruel noblewoman and takes her on as a study companion, building a close bond over shared classes and archery practice. He values honesty over courtly pedigree and struggles to balance his political duties with his personal desires.

Wenzhi is a renowned captain in the Celestial Army who commands troops on dangerous missions across the immortal worlds, earning fame for his military prowess. He presents himself as an orphan from the Four Seas who achieved his rank entirely through merit. He mentors Xingyin when she joins the military, treating her as an equal and offering her opportunities to prove her combat skills. He is confident, charming, and frequently at odds with Liwei.

Chang'e is the legendary Moon Goddess who resides in exile on the moon. She drank the Elixir of Immortality to ensure a safe childbirth for Xingyin, resulting in her permanent separation from her mortal husband. She is a devoted mother who sacrifices her own freedom to keep her daughter hidden from the wrath of the Celestial Court.

The Celestial Empress is the unforgiving co-ruler of the Celestial Kingdom. Originally from the Phoenix Kingdom, she harbors a deep grudge against Houyi for destroying the sunbirds, her kin. She frequently inspects the moon for irregularities and demands absolute obedience from her subjects, prioritizing her son's pedigree and political matches above all else.

The Celestial Emperor is the powerful ruler of the immortal kingdoms. He maintains his authority through strict laws and severe punishments, having previously banished the legendary dragons and imprisoned Chang'e. He expects total compliance from his family, his army, and his subjects, refusing to tolerate any challenges to his absolute power.

Shuxiao is a career soldier in the Celestial Army who enlists to protect her large countryside family from political rivals. Though she secretly dreams of returning to a quiet domestic life, she rises through the military ranks out of duty. She is practical, perceptive, and unfailingly loyal to her friends, frequently using her position to support Xingyin through difficult trials.

Yanxi is the scholarly eldest son of the Eastern Sea Kingdom. He possesses extensive knowledge of the banished dragons and prefers logical, peaceful resolutions over open warfare. He is deeply protective of his younger brother, Yanming, and treats visitors to his kingdom with calm, genuine hospitality.

Jianyun is a blunt, highly skilled military instructor and leader in the Celestial Kingdom. He appreciates students who show candor and determination, pushing back against the typical flattery of the court. He recognizes Xingyin's natural talent for combat early on and encourages her to pursue a formal role in the military.

Fengmei is a visiting royal from the Phoenix Kingdom and the niece of the Celestial Empress. She travels to the Jade Palace as a political match for Liwei, intending to strengthen the military and political alliance between their two kingdoms.

Houyi is a legendary mortal archer who saved the world by shooting down nine scorching sunbirds. He received the Elixir of Immortality for his heroism but was permanently separated from his wife when she ascended to the moon without him. He remains a beloved, heroic figure in Xingyin's mind.

Ping'er is the loyal companion and servant to Chang'e on the moon. She helps maintain the illusion of an empty lunar residence to protect Xingyin's secret existence and directly assists the young woman when she is forced into exile.

Meiling is a privileged noblewoman residing at the Golden Lotus Mansion. She frequently punishes her servants for imaginary infractions and serves as Xingyin's harsh introduction to the severe class prejudices of immortal society.

Minyi is a cheerful kitchen maid at the Jade Palace. She befriends Xingyin early on, generously sharing food, palace gossip, and important historical context about the royal family's past conflicts.

Yanming is the younger brother of Prince Yanxi in the Eastern Sea Kingdom. He initially acts aloof but quickly bonds with Xingyin over mock sword fights and shares local legends regarding the region's ancient dragons.

Hualing is the former Flower Immortal who lives in isolated disgrace. She bears deep physical and emotional scars from a past conflict with the Celestial Empress, leading her to harbor intense, dangerous resentment toward the entire royal family.

Anmei is the dedicated governess for Prince Yanming in the Eastern Sea Kingdom. Xingyin temporarily impersonates her during a dangerous mission to ensure the young prince's safety.

Renyu is the highly ambitious representative for the merfolk in the Eastern Sea court. He refuses royal summons and leads a violent uprising, utilizing a glowing necklace to control his troops against their better judgment.