Frigid by Giao Chi

Dong Tu may be a normal girl, but her high-profile affair with the Whispered World’s most dangerous man, Obsidian, has created more attention than she needs. 
Set in a fantasy world similar to ancient Asia, The Winter Epic series is the story of Luu Dong Tu and the dangerous Eighteen of the Whispered World. It is a riveting adventure in the fantasy martial art world of swordplays, air bending, wind walking, superpower, elemental magic, and martial art combats...
Books in the series are stand-alone although it's recommended to read them in this order: 
#1 “The Girl Who Kept Winter” is a journey of falling in love for the first time. Join Dong Tu as she discovers Obsidian’s true identity and resolves the mystery of the snow and the poison that laces his skin.
#2 “Frigid” introduces a love triangle and the rivalries between Luu Dong Trung, a beautiful man with no martial art skills, and the most dangerous man of the Whispered World, Obsidian. 
These beautiful, page-turning love stories will keep you longing for more.