In Republican-era Shanghai, Murong Qingyi, the son of a warlord who was switched at birth, endures years of torment. His life changes when Ren Susu saves him, but it is precisely because of this that tragedy strikes her family. Years later, love blossoms between them, but Ren Susu fakes her own death to save someone else, leaving Qingyi heartbroken. Three years later, she returns as his future sister-in-law. Love, hate, betrayal, and old wounds resurface. With war looming, the two must defy fate together, but can their love survive the fall of a nation?