An Ancient Love Song

Also known as: Emperor Shengwu of Nansheng

Chu Tong Shang is the orphaned descendant of the assassinated King of Bei'an, taken in and given his name by Lu Yuan after his family is destroyed by Li Yong's treachery. He is raised within Lu Yuan's household under her protection. Cast listings indicate he is later associated with the identity of Emperor Shengwu of Nansheng, suggesting he grows into a significant ruling role, though the exact connection between his childhood and adult depiction is not fully detailed in available sources.

Also known as: Uncle Guo

Guo Lao Tou, known familiarly as Uncle Guo, is an elder connected to Lu Yuan's household who helps protect the young Chu Tong Shang after his family's destruction. He is the one who reveals to Lu Shi that Li Yong assassinated the King of Bei'an, a disclosure that shakes Lu Shi's trust in his adoptive father.

Lu Liang is identified by the user as Lu Yuan and Lu Shi's biological father, raising them under humble, rural conditions in the border region before the family was torn apart by political events. His absence or death is described as pushing Lu Shi toward a military path and leaving Lu Yuan to carry the burden of protecting the family.

Also known as: Zhou Gongzi

Mr. Mu Jian, also referred to as Zhou Gongzi, is the arrogant son of the local Mu Jian, a government official overseeing imperial horses and lands. He serves as a minor local antagonist who attempts to force a young Lu Yuan into marriage; she pretends to agree in order to protect her family, and he grows suspicious enough to have her watched, creating an obstacle Shen Bu Yan and young Lu Yuan must maneuver around.

An unnamed elderly woman sells trinkets near a wishing tree in the modern-day setting, including the broken jade pendant that becomes Shen Bu Yan's means of time travel. She warns him that incomplete jade carries spiritual influence, a comment that proves significant, and she mysteriously disappears when he later tries to find her again.

An unnamed mother, likely connected to the little refugee girl character.

An unnamed pair of background characters seen near the wishing tree in the modern-day setting, played by two credited guest actors.

An unnamed background performer appearing in a festival or court scene.

An unnamed waiter or staff member at Jing Hua House (Jinghualou), the establishment where Lu Yuan gathers information and where several key scenes take place.

An unnamed child among refugees affected by the wartime unrest between Nansheng and its enemies, likely tied to the refugee settlement subplot Lu Yuan is called on to resolve.

Xiao A Sang is a lively, cheerful resident of the border village where Lu Yuan and Lu Shi grew up, functioning as a comic-relief, gossip-spreading local villager. She appears during Shen Bu Yan's earlier time jumps as one of the townspeople witnessing his interactions with a younger, still-uncorrupted Lu Yuan.

Also known as: General Bei Lie

Yuwen Po Xiao, known in battle as General Bei Lie, is a northern military commander tied to the conflict between Nansheng and its enemies. No further plot detail is confirmed in available sources.

Yuwen Po Jun is described in cast listings as a fierce vanguard commander from the northern enemy forces. No further plot detail is confirmed in available sources.