A Sharp Sword to Protect the Country is a Manga/Manhwa/Manhua in (English/Raw) language, ACTION series, english chapters have been translated and you can read them here. You are reading A Sharp Sword to Protect the Country chapters on viptoon.net, fastest updating comic site. The Summary is
Lin Xiao, The nine star commander in chief of dragon kingdom, was betrayed by his friend, and became a fool overnight. He was humiliated. Thanks to his fiancee Qin Wanqiu's constant care for two years, Lin Xiao finally regained his mind and vowed that he would protect Qin Wanqiu, and would make those who humiliated him return ten times!