Cao Jin, a gentle and kind-hearted modern social animal, accidentally traveled into a bloody palace fighting novel and became a background NPC destined to be tortured and killed. In this world where everyone is fighting in the palace and their IQs are on the line, everyone is counting on the emperor's favor and authority. But Cao Jin soon discovered that as long as she completed her tasks, the system would give her an "overtime subsidy": medical skills, word making, art of war, mechanical skills... While others were competing for favor, she was developing skills; while others were framed, she was engaged in infrastructure construction. When all the concubines thought she was a harmless little white rabbit, Cao Jin had already built an intelligence network, underground hospital, and even improved the harem's economic system in the palace by relying on "system rewards". It wasn't until the emperor discovered that this "most insignificant" concubine actually controlled the lifeblood of the entire dynasty - and at this time, the heroines of the original book realized that this NPC had changed the rules of the entire story.
