Lin Xiao, a gentle and tough kindergarten teacher, was involved in the strange "Infinite Kindergarten" system after rejecting the forced contract of the paranoid boss Gu Yan, and was forced to take care of all kinds of "high-risk cubs" in different terrifying worlds. What makes her even more desperate is that she is trapped in a time loop with death as the node. Every time she fails in a mission, she will return to the day when she was coerced by Gu Yan. And she gradually discovered that the ultimate boss in every world was the man who loved and hated her in reality. When parenting skills become the law of survival, when love and control repeatedly see each other between life and death, she must comfort the monster cubs while "educating" the paranoid broken heart in order to break the cycle and win true freedom and redemption.