WARNING: SPOILERS

Maybe the easiest way to guess who is Kunwu is by elimination so I am keeping a list of who can be ruled out as Kunwu as we go along. Please add to it / share your eliminations and why.

What we know about Kunwu:

  1. Long hidden/dormant Japanese spy. 
  2. Reactivated 5 years ago
  3. He is confident of reuniting with his family soon. Most like wife + son and daughter.
  4. He suspected that  Muzhi faked his death in Shanghai but he did not know for sure
  5. He sent a sketch to warn Milan not to be distracted and fall for Hongqi.

Eliminations:

  1. Yang Ziming - based on (4) he knew Muzhi faked his death bc he asked him to
  2. Assistant Wu - is privy to (4) as Yang Ziming confides in him
  3. Yun Hongqi - Based on (5) Hongqi cannot be Kunwu
  4. Li Liang - dead