Episode 14 - S1.E14

Knowing that a mysterious man is threatening An Na, Zhi Ping asks her to lie about being blackmailed and thus finding Zero for help. He works with her to uncover the man's identity. The mysterious man, Uncle Gui, calls An Na. She drags the time for the team to trace his location. The vigilant Uncle Gui hangs up the call so Zhi Ping only manages to trace the call coming from Si Nuo Ao's network.