The Army's Little Lucky Koi: Number One at Making Trouble

Lin Ruanruan is a five-year-old girl who is actually the reincarnation of a koi fish from the Heavenly Court. After falling from the Jade Pool, she is reborn into the body of a rural woman who drowns while visiting her husband on a military island. Her father, Lin Dayong, a soldier, brings her to live with his new wife, Su Ting, a doctor at the military hospital. Lin Dayong instructs Ruanruan to act as a troublesome child to protect herself from a perceived wicked stepmother, fearing she cannot protect her daughter as he failed to protect her biological mother. However, Ruanruan quickly discovers that her father is not the protective figure he pretends to be; he is secretly colluding with Su Ting, using Ruanruan as a tool to please his new wife and advance his career. Ruanruan realizes her mother’s death may have been orchestrated by Su Ting, who harbored a secret love for Lin Dayong and resented the biological mother.

Ruanruan possesses a Sea Fishing System that upgrades when she is near the ocean, granting her items like a never-empty fishing rod. Instead of following her father’s script of causing public scenes, she chooses a different strategy. She acts sweet and obedient while secretly using her system to catch massive amounts of fish. Her exceptional luck and ability to teach others how to cook delicious meals, using seasonings from her system, win her the affection of the neighbors and the military compound residents. This success threatens Su Ting’s position as the favored mother and undermines Lin Dayong’s plan to keep Ruanruan marginalized. Su Ting, initially trying to maintain a kind public image, becomes increasingly frustrated by Ruanruan’s competence and popularity.

The conflict escalates when Ruanruan’s stepsister, Su Xiaomei, acts as a malicious supporting character. Jealous of Ruanruan’s attention and gifts, Su Xiaomei steals Ruanruan’s snacks and system medicine powder, then scatters food scraps to attract insects to bite Ruanruan. Ruanruan anticipates this and exposes Su Xiaomei’s theft and sabotage in front of the neighbors. Su Ting, fearing a scandal that could ruin her husband’s promotion, is forced to publicly apologize to Ruanruan and compensate her with expensive goods. This incident deepens Su Xiaomei’s hatred and reveals the toxic family dynamics where Ruanruan is an outsider in her own home.

Ruanruan decides to participate in the annual military-civilian fishing competition to earn more points and money. Using her system’s scanning ability, she finds a prime fishing spot and catches an extraordinary amount of fish, impressing the local cooperative director, Chen Hai. Her father, Lin Dayong, grows increasingly anxious about Ruanruan’s growing influence and her refusal to act like the "foolish" child he trained her to be. He warns her to keep a low profile, but Ruanruan remains confident, relying on her luck and system to navigate the dangers. The story follows her struggle to survive in a hostile environment, uncover the truth behind her mother’s death, and protect herself from the conspiracies of her father and stepmother.

As Ruanruan continues to thrive, she builds alliances with kind neighbors and children, turning the community into her support network. Her stepmother and stepsister resort to more subtle schemes, but Ruanruan consistently outmaneuvers them with her mature mind and system advantages. The narrative highlights the contrast between Ruanruan’s outward innocence and her inner strategic brilliance. She uses her father’s expectations against him, playing the role of a clever child while secretly gathering resources and information. The central tension revolves around whether Ruanruan can expose the truth about her mother’s death and escape the manipulative control of her father and stepmother, or if she will be crushed by their combined efforts to maintain their social standing.