Palace maid Shen Yuan discovers that what is locked in the abandoned well of the cold palace is not the deposed empress, but Crown Prince Xiao Jue, who was framed by political enemies. She risks danger to deliver food and medicine, but becomes exposed under the surveillance of the vicious mammy. To protect Xiao Jue, she cleverly uses a blood letter as a warning and sets a fire to create chaos to help him escape. Xiao Jue leaves behind a token, and from then on Shen Yuan becomes his secret agent within the palace, enduring torture and testing, and finally cooperating with a feigned injury ruse of distracting the enemy to seize a key map from Mammy Li, successfully breaking away. She temporarily takes refuge in the imperial garden's herb garden, quietly awaiting the resurgence of winds and clouds.