Another news and series of events, Nadech will be fine. But this lakorn would be a great opportunity for him. People are looking forward to see him in such a big project with another nang ek. He could prove that he could have great chemistry with another girl aside from Yaya. Acting wise, this will also help people see him grow more. But nevertheless, he will be fine.
As for Matt, she has more to lose, career wise (as an actress). It feels like forever since she was filming her last lakorn. She is so underrated. This will be her biggest project to date, and she was even paired with a very popular pra ek of this generation. This year, she also has been getting events and ad deals left and right. She could gain more fans after this (but then the scandal came and she got haters/bashers lol)
But if the rights for this will be sold to China, how can this be cancelled? It's gonna be a loss for ch3. For broadcast thai, after BPS, this could be a hit too (if executed well). They invested in here too. From buying the rights to all the production cost.