Can I transfer jobs through open recruitment if the original institution does not let go?

I suggest that you'd better change your tone and don't consider quitting. Actually, this is very simple. You should first find the leader of your former unit and give him a gift. The reason why he won't let you go is because the welfare is not in place and he deliberately messed you up. If you resign, maybe someone from your former unit will sue you in your current hospital, then you are unreasonable and can't explain clearly. These things are not particularly complicated. Good luck.