Frankly, it was foolish of the girl to return to town alone just because she was curious about her twin. Especially when the Gong clan had declared war on Wufeng, the swordsman crying and waiting for the girl at the door was nonsense.
I don't think Wufeng will kill YWS. They could probably sacrifice the twin sister and leave her there, or send her back to the valley to provoke the swordsman. As long as they don't mimic the girl's scars, in time it can be confirmed that the body is not hers.
I don't think season 2 will come, but I hope it does.