Episode 19 - S1.E19

With Emily's help, Zhi Ping infiltrates into Si Nuo Ao to find evidence but realises that he has fallen into a trap and has no way of escaping. Just when he is panicking, "Ghost" appears and rescues him. Zhi Ping does not know that Si Yun is "Ghost" and asks her why she is helping him. Si Yun does not answer him directly but only warns him to stop doing illegal activities in the future.