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It looks like they continued to meet up and got closer, but then other humans attacked, the village of the MC and he was deadly wounded. Before that it seems like Mr. Dragon connected them somehow, or they did the contract (I don't know chinese, so I am not sure want happend). But after the MC was wounded Mr. Dragon got free from the chains and hurried to the MC. He protected the MC and hold him close, so I think he saved the MC (turned him into a witch).
I really ship these two more than the MC and the angel guy.

Here you go.
https://www.kuaikanmanhua.com/web/topic/5930/
... So he killed Ye to be free of curse and to gain freedom?? So, in this story... Witches are formed because of dragons???
And how an angel also got cursed??
Too many questions to be answered