 If you liked
Threads of Time
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 ...then you might like
Legend of Nereid
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These two Manhwa's are similar for several reasons. Legend of Nereid, and almost the whole story from Threads of Time are placed in a society or a cultural setting from roughly 1 millenium ago.
Eventually you could say both of the stories are about a normal teenager that excels in armed combat practice, who later on will be dragged down to the battlefield.