Jiang Qiyun and Yu Guiwan grew up together in a police residential compound, one lively and impulsive, the other quiet and introverted—yet despite their contrasting personalities, they became the best of friends. Before their budding teenage affections could blossom into poetry, both faced a life-altering tragedy: their fathers, both detectives, died in the line of duty while jointly investigating a serial murder case. This tragedy drove a wedge between their future paths. Jiang Qiyun, who had always idolized her father, became even more determined to become a courageous detective, upholding the law and the justice she believed in. Unable to change Jiang Qiyun’s mind, Yu Guiwan left to study abroad, cutting all contact between them for ten long years. During that decade, Jiang Qiyun rose through the ranks as an exceptional detective working major cases, believing time had erased the fleeting infatuation of her youth. But when the girl from her memories reappeared as a poised, confident woman, the hazy recollections of an innocent kiss suddenly became vivid and undeniable. Yet the once-shy Yu Guiwan was now radiantly elegant and effortlessly charming, smiling warmly at everyone. Even more shocking—the person who had once most opposed her becoming a cop had now joined the police force as the bureau’s newly hired criminal profiler. Jiang Qiyun stared at the dazzling, vivacious Yu Guiwan and said icily, "Long time no see." But right in front of everyone, Yu Guiwan looped her arm around Jiang Qiyun’s, leaning in to whisper intimately, "A-Yun, I missed you so much."