After Sun Chenran returned to the city with Ye Yaqing's common secret, he found that the surveillance in his kindergarten frequently had "empty frames", and every time it was interrupted, it happened to point to the old case that he was least willing to admit. In order to protect his daughter and Ye Yaqing, he followed the "ledger-style" clues step by step, and reversely exploited the monitoring loopholes of the operator behind the scenes to force the other party to reveal their motives. The closer to the truth, the more accurate the threat; the more he is forced into a corner, the more he wants to write the counter-attack into the next piece of evidence.
