Kang Geon, a 17-year-old who transferred to an elite high school attended by only the top 0.1% in Korea. Since the age of five, he has been raised in secrecy in North Korea as a human weapon. A genius, he is tasked with infiltrating the upper class of society and creating connections. However, making friends turns out to be an even bigger mission than expected. Together with his father, a retired hitman, and his legendary assassin mother, he lives as part of a fake family, embarking on a journey to find true happiness in the midst of danger in this thrilling action drama.