He Yan is the oldest daughter of the respected He family. To protect her family's honor, she pretends to be her brother, He Rufei, and joins the military. She works hard and becomes a well-known general. But when her real brother returns, she is betrayed and has to run away.
She takes on a new identity and joins the army again, where she meets Xiao Jue. At first, he doesn’t trust her and thinks she might be a spy. But as they face battles, lies, and loyalty tests together, they grow closer — and eventually fall in love.