Are you implying that contractors are virtual prisoners who can't break their contract or otherwise just walk off the job? I doubt that any airline anywhere would be ripping off your shirt to drag you into the cockpit to make you fly.
At Dynasty's competitor, EVA, certainly. They have a very high training bond. You can make a runner of course, but then you won't have any papers.
So unless you're lucky enough to find another job somewhere where they don't require a letter from your previous employer, you can only put up with all the sh1t and wait for EVA to let you go. China Airlines will probably be similar.