The core question that this novel ultimately answers is: when rebirth gives a person the opportunity to "re-choose", the best way to live is not to avoid risks, but to walk towards the same fire scene more clearly with the scars of the previous life - only this time, he wants to build a firewall for the entire city.
Song Zhihao's ultimate transformation is from "personal hero" to "system builder", from "protecting those around him" to "cultivating guardians". When the young cadres he trained formed a new rescue echelon, the sacrifices in their previous lives truly gained value beyond time.