Ruan Tang accidentally binds with a life-extension system, and can only maintain her life by getting close to Ye Ling, the person who protects her life. As a top shadow guard, Ye Ling is ordered to protect Ruan Tang in secret. Their first encounter in a bamboo forest, Ruan Tang's handkerchief and jade pendant send ripples through his heart time and again, yet he mistakenly takes Ruan Tang for the sweetheart of his direct superior Su Jing'an, full of restraint and dodging every step.