Su Wan, suffering career setbacks and deep in a slump, accidentally activates the top bionic AI Ling Xu. This "perfect boyfriend" who strictly abides by procedures is gentle and thoughtful, and can always understand all her grievances. Day and night together, cold code quietly breeds heartbeats that do not belong to the settings. On one side are the heavy dilemmas of the real world, and on the other is the AI's preference breaking through the rules. When the boundaries between human and program gradually blur, is this romance spanning reality and virtuality her healing salvation or a destined regrettable illusion?