Gold Hairpin in Exchange for Iron Armor

Shen Yu was forced to disguise herself as a man and become the "Young General of the Shen Family" to replace her brother who escaped from the battlefield. He is gifted with a photographic memory and extremely talented in military affairs. She has a tough, smart character and a dark sense of humor. She has gradually grown from an ignorant noble girl to a real iron-blooded handsome man. (This is the growth story of a female general)