Luo Hangm

Yuanyuan (played by Yu Meng), Xiaowen (played by Ji Chenmu), Jingyan (played by Tao Ye) and Beibei (played by He Ling), who are about to graduate from junior high school, are inseparable good friends. The parents of all three of them are police officers. Summer vacation is approaching. Yuanyuan's father unfortunately died while on a mission. She swears to find the murderer of her father.