My Sister Is the Warrior Queen

Abandoned by their parents, sisters Catherine and Grace Blackwood grew up with only each other for support. As adults, they both built successful lives. But at Grace's engagement party, Catherine arrives straight from a covert mission, still dressed as a cleaner, and becomes the target of ridicule from Grace's in-laws and former classmates. When Grace is betrayed and humiliated by her fiancé, Catherine reveals her true identity as the Warrior Queen, making everyone regret underestimating the sisters.