Your Majesty, Your White Moonlight Came Back with a Bun!

Lin Lang, a modern office worker who dies from overwork, awakens in the body of Ning Mo, a top scholar in the Cangxuan dynasty who was murdered three years prior. Ning Mo was the Emperor's beloved companion, drugged and pushed off a cliff by his jealous half-brother Ning Bai, the novel's protagonist. Lin Lang is bound to System 001, which reveals that the world is a fictional book destined to collapse because the villainous Emperor will destroy the dynasty while searching for a way to resurrect Ning Mo. The system's only solution is to revive Lin Lang and task him with accumulating energy points by helping the Emperor become a wise ruler, thereby preventing the world's destruction.

Complicating matters, Lin Lang discovers he is pregnant with Ning Mo's child—a son born from the forced intimate encounter with the Emperor three years ago. The boy, nicknamed Little Chubby, is now two years old and weak due to congenital toxins from poisoning during pregnancy. Lin Lang must balance raising his son, completing his system tasks, and navigating court politics while hiding his true identity and past life memories. He retakes the imperial examination under his own name, Lin Lang, and tops it, earning the Emperor's intense attention due to his striking resemblance to Ning Mo.

The Emperor, now tyrannical and neglectful of state affairs since Ning Mo's death, initially treats Lin Lang as a substitute for his lost love. When Lin Lang saves Censor Zhao from suicide during the appointment ceremony using a miraculous pill, he gains the Emperor's trust and is appointed as a fifth-rank Hanlin Scholar and Imperial Attendant, a rank never before granted to a new top scholar. The Emperor's stubbornness and emotional volatility create constant tension, as he oscillates between anger, nostalgia, and moments of unexpected warmth, particularly when interacting with Little Chubby, who bears a resemblance to both Lin Lang and Ning Mo.

Lin Lang's first major system task involves persuading the Emperor to approve border trade with the Hu tribes, a decision the cabinet opposes but which would generate significant revenue for the dynasty. Using his modern knowledge, Lin Lang frames the proposal as a trial that benefits the Emperor's private treasury first, appealing to the Emperor's self-interest. The Emperor agrees, marking his first engagement with state affairs in three years and impressing the court ministers. This success earns Lin Lang energy points and advances the detoxification treatment for Little Chubby.

As Lin Lang integrates into court life, he faces opposition from Hanlin Academy officials who resent his favoritism and the presence of a child in the workplace. Dean Hu attempts to punish Lin Lang for bringing Little Chubby to duty, but the Emperor intervenes, punishing Dean Hu instead and ordering Lin Lang to bring his son to the palace. The Emperor's growing attachment to Little Chubby, combined with his complex feelings toward Lin Lang as a Ning Mo substitute, creates a delicate dynamic. Lin Lang remains cautious, aware that the world's rules punish deviations from the original plot, and that his half-brother Ning Bai, the novel's protagonist, possesses blessed fortune that makes direct confrontation dangerous until he accumulates sufficient energy points to act independently.