I think it is because Xu Zhengqing didn't know what Wenjie knew. Ding Shenghuo was in prison for 10 years, so…
Wenje would never tell him what he knew, because he could alter any little thing and it would screw things up. But having him think he was on his side made him convinced to tell the truth. So he just spent toooons of money and effort on the mission impossible route, and we get a plot twist and a " All we knew was a lie " moment.
I think it's fun - u know usually when main character goes to hospital they leave from near death wound the next day. But in this one he stays there for like four episodes!? My favorite part!!
I'm interested to see what he will potray this time. I really likes Island
(Or do I need to get over it and just watch it haha)