GENIUS Spy accidentally marries a Heartless Assassin

Lloyd, also known as Twilight, is a top spy for West Dallas, who lost his parents to war and possesses incredible skills such as speed, intellect, and combat abilities. He is known for his ability to disguise himself and manipulate situations to serve his missions. His current task involves infiltrating the opposing party in Austinia by getting close to Donovan Desmond, the leader of the party and a threat to the truce between West Allis and Austinia. To do this, Lloyd must adopt a child to gain access to Eden College, where Desmond's son studies, and gather information. Lloyd adopts a telepathic girl named Anya, who has been a test subject for experiments, and they embark on a mission filled with challenges and unexpected twists.

Lloyd's mission takes a turn when his cover as a family man is compromised after an ambush. He is forced to rethink his strategy and decides to send Anya back to the orphanage. However, Anya's intelligence and attachment to Lloyd make it difficult to part ways. Meanwhile, Lloyd encounters a woman named Yo, who is revealed to be a cold-hearted assassin. Despite the risks, Lloyd and Yo form a bond, and she agrees to pretend to be Anya's mother for an upcoming interview at Eden College. This alliance further complicates Lloyd's mission, as he must balance the demands of espionage with the responsibilities of his makeshift family.

Lloyd, Anya, and Yo engage in a series of activities to appear as an upper-class family in preparation for the Eden College interview. Despite their efforts, they struggle to fit into the elite lifestyle. During a day out to practice being a 'normal' upper-class family, they encounter a thief, which leads to a display of their unconventional skills. Later, at the interview, the family faces a series of challenges designed to test their elegance and composure. Lloyd and Yo's genuine concern for each other and Anya shines through, even as they face scrutiny from the interviewers. Their unconventional family values and unorthodox approach to problem-solving leave a lasting impression on the interviewers.

During the final stages of the interview, Lloyd and his makeshift family face a series of questions that test their unity and values. Despite some tense moments, they manage to impress the interviewers with their honesty and strength. However, the situation takes a turn when one of the interviewers, Swan, becomes hostile and challenges the family's integrity. The interview ends abruptly when Lloyd loses his temper, fearing for his daughter's emotional well-being. The family leaves the interview with a sense of failure but is later informed that Anya is on the list of successful applicants, contingent on other students withdrawing. Yo decides to take matters into her own hands to ensure Anya's acceptance, showcasing her commitment to the family.

After a series of unfortunate events, Lloyd's family finally receives the good news that Anya has been accepted into Eden College. They celebrate their success, but their happiness is short-lived as new challenges arise. Lloyd is contacted by his headquarters with information about the next phase of his mission, which involves ensuring Anya becomes an imperial scholar. Meanwhile, Yo faces a personal crisis when Anya is abducted, testing her maternal instincts and combat skills. Despite the danger, Yo successfully rescues Anya, reinforcing her determination to protect her makeshift family at all costs.

Anya starts her school life at Eden College, facing bullying from her classmates, particularly from Desmond's son, Damien. Despite her struggles, she finds an ally in Becky, another student. Meanwhile, Lloyd and Yo continue to navigate their roles as parents, dealing with the challenges of maintaining their cover while advancing Lloyd's mission. When Anya is accused of using violence against a bully, tensions rise, and the family faces potential expulsion. However, Anya's actions are revealed to be in defense of a friend, and she receives a reduced punishment. Despite the setbacks, the family remains united, and Lloyd becomes more committed to his role as a father figure, even as he grapples with the complexities of his mission.

As the story unfolds, Yo faces a personal crisis when her brother Yuri, who works for the secret police, visits unexpectedly. The visit tests the unity of the makeshift family and reveals that Yo has been secretly trying to be a better mother and wife. Meanwhile, Lloyd becomes increasingly suspicious of Yo's involvement with the secret police, leading to a confrontation where he confirms his suspicions are misplaced. The incident strengthens the bond between Lloyd and Yo, and they continue to support each other in their roles as parents and spies.

Anya's status at school changes dramatically when she heroically saves a fellow student, Ken, from drowning during a therapy session at a hospital. Her bravery earns her the admiration of her peers and the first Stella award, a prestigious recognition at Eden College. This achievement boosts her image and brings her closer to achieving her father's mission objectives. However, the incident also intensifies Damien's rivalry with Anya, leading to a new set of challenges for the family.