Yes, he adopted a son.
Thinking about it ,it makes sense that XSL has no biological off spring.This is because of the 'time travel paradox'. You have have a time loop that has no beginning or ending , very confusing.
From mortal to immortal beings ......XioPan offspring (Chin fam) against XiangShioLong descendants(Xiang fam)
Continue in this "Stellar Transformations" .......Reveal more in actions than history as "a step into the past"..........
this novel more like an imperial court struggle than wuxia right ?
Less to none of the fantasy flying around or inner energy.
XSL was master of sword and sabre and successively beat out most of the book's sword "gods" using Mozi swordplay and his own take on samurai techniques. Towards the end, he exuded fighting "aura" that scared away opponents who dared approach him.
He "invented" weapons/tools using 21st century knowledge such as sabres, flying needles, skiing equipment, grappling/wall scaling, lightweight armor based on bulletproof vests.