Soo Ho dies saving Young Ro. Kim Man Dong turns out to be a North Korean spy. He kills Eung Cheol and Joo Gyeok Chan. But he rectifies his mistakes by killing the other north Korean spy while dying trying to protect Soo Ho. Cheong Ya leaves South Korea with 300 million vowing Soo Ho to protect the family members of the fallen comrades from the North. Seung Hee is the friend of Boon Ok's dead sister who made a false report on her because Ahn Kyung Hee tortured her. And finally the brocode lives as Soo Ho calls Kang Moo hyung and asks him to take Young Ro with her. In the end we get a tape from Soo Ho in which he confesses his love for Young Ro. Some 'your lie in April' type of farewell. Which would have hit the mark according to me if it was a letter written on a paper plane.
It is a theory I came up with. So let me brief you about it a little. We already know that Boon Ok's sister was a north Korean spy in others eye but she believes that her sister was framed. Now we already know that Seung Hee was forced to acknowledge that she is a north Korean spy. Also she hides a half bent photo of herself with somebody. Which I believe is her photo with Boon Ok. I think that this framing incident happened when Boon Ok was small so she doesn't remember her face. Otherwise I don't know why she is protecting her. I hate Boon Ok to death but I have a feeling that Seung Hee will die protecting her.
We don't know how much time has passed since boon ok sister was labelled as a spy. Maybe she was little back then. Otherwise I can't think of any reason why Seung hee keeps defending her.
If you know you know