Iron Widow by Xiran Jay Zhao

So it's like...a retelling of the origins of the Tang dynasty, but it's in the future, and not everything is accurate, and there's fighting robots (did my brain think of Voltron--yes)
Me appreciating the content notice at the beginning of the book. chef's kiss. 

If by Christmas, you mean "life."

....My brain also thought of The Cutting Edge. 
Hey look. An actual triangle. 
....Ok so the epilogue...that... umm...huh.
400 Pages