Who the hell is that supposed to be? I don't remember seeing Yu'er before...

His girlfriend from the very beginning. She was taken away and he is training to be strong enough to retrieve her. This person (if it is really her) claims that he doesn't know what she has been through (in all that time they have been separated). She also looks much older than the little girl she was in the beginning of the show. That might be why he attacked her at first. I recognized her immediately by the hair and the mark on her forehead.

lol

MC gave his sword wife her own martial soul. SWEET!