Back to the Qin Dynasty (Cantonese)

Xiang Shaolong (Louis Koo), a man from the 21st century, once traveled through time and helped the King of Qin (Raymond Lam) unify the realm. Their fates, intertwined across time, bound them together as mentor and friend. Years after Xiang Shaolong retired to a quiet life, an unknown time-traveler suddenly appears, threatening to topple the empire. The King of Qin is forced to seek help from the reclusive Xiang Shaolong. Facing a formidable enemy capable of rewriting history, can they set aside their differences and unite against the threat? Will the bond of mentorship, loyalty, and gratitude protect them, or become a blade turned against each other?