Professor Klein is a Swiss professor who serves as a therapist and mentor figure in the story. She conducts Boundary Anchoring Therapy sessions with Ruan Xingchen, monitoring emotional fluctuations through technology. She observes that trust levels have increased by 17 percent and notes that the therapy effects are more significant than anticipated. She provides wisdom to Ruan Xingchen, stating that science requires evidence but the inclinations of the heart are sometimes clearer than data. Her protection is so valued that Mo Xiaohan has made it clear anyone who dares touch her will face extermination of their entire family. She is targeted by Lin Wei who hires mercenaries to ambush her.
