Yu Chuangshi, the grandson of Yu Fuying - the richest man in Shanghai, killed his cousin Lei Xiaodong's lover who was also his rival for love in a drunken shootout after a failed romance. All this was witnessed by Shen Zijun. Shen Zijun's brother Shen Xinchi worked in the police station. In order to please Yu Fuying, he hinted to Shen Zijun to change her testimony so as to exonerate Yu Chuangshi, but her sister firmly refused. When Yu Chuangshi heard this, he became furious and thus a feud began between him and Shen Zijun.