In troubled times, the Wei and Qiao families are at odds with each other due to old blood feuds, and a political marriage becomes the only hope to resolve the feud. However, above the Qiao family's daughters Da Qiao and Xiao Qiao who are about to get married, there is also a "sick" eldest daughter who has never been shown to anyone - Qiao Yun.
She is the adopted daughter entrusted by Qiao Ping on his deathbed, a secret carefully hidden. On the surface, she is an "invisible person" who was sent to the mountains to rest because of her frailty; secretly, she holds the twelve "cold shadow guards" left by her parents and an intelligence network all over the world. She worships her parents' old department and grows into an all-rounder with both civil and military skills and extraordinary vision.
When she learned that Yanzhou was not planning to send troops to aid Xindu, Qiao Yun stepped from behind the scenes to the stage for the first time and sent her subordinates to set up a maze to save the people from fire and water, and accidentally saved Wei Shao's brother. This incident shocked the world, and also threw an unknown variable into the game between the Qiao and Wei families.
When the marriage agenda was put on the table, Qiao Yun, who knew that neither Wei Shao nor Liu Yan was a good match, was determined to change the fate of the two sisters with her own hands. While she secretly helped Da Qiao elope with his beloved Manubishu, she also showed Xiao Qiao the intelligence she had collected about Liu Yan's cruelty and Wei Shao's danger, in an attempt to keep her sisters away from the center of the political whirlpool.
However, in the step-by-step planning, Qiao Yun's chess game unexpectedly encountered the young monarch Wei Shao. From a battle of wits in the distance to an unexpected encounter, two hidden souls "bend" each other in trials and games...
