The woman's name was He Fei, and she was the daughter of the late He clan leader.
The He clan members were indeed descendants of He Yun.
When the Thousand Flame Valley was destroyed due to the Crimson Karmic Lotus Flame, the youngest son of the He clan happened to be traveling abroad at that time. Hence, he was fortunate to survive that catastrophe.
Soon after, that youngest son re-established the He clan, which eventually grew and prosper. With that, they became a decent immortal orthodoxy.
Unexpectedly, the Lin clan recently found the ruins of the Thousand Flame Valley and excavated the site, obtaining many treasures buried within.
However, the innermost core area of the Thousand Flame Valley was still enveloped by the Crimson Karmic Lotus Flame. Even an Immortal would find it hard to get near to it. That was when they set their sights on the He clan's Immortal Weapon… the Fire Dragon Cloak!