The 100-meter champion Wu Tianyi returned to his hometown to unravel the knot that he couldn't defeat the old flying man Hao Chaoyue.
A serial killer is victimizing the city of Linghai so criminal police investigator Ji Fan , Captain Xiong Zhen Nan, and forensic doctor Zhao Qing Yan create a task force to launch an investigation. The case becomes complicated when Ji Fan realizes that the killer might be close to him and found to be related to an old case 27 years ago that leads back to his own family - his Ji Ting Shan and older brother Ji Ping who lives with him.
When top secret research on the newest Bathyscaphe technology is stolen, a task force headed by Hong Shao Qiu and Ye Han is assigned to solve the case while the nation's secrets and defense is on the line.
