Eighty years after the victory in World War Two and the defeat of fascism, the echoes of history remain: peace is precious, and never guaranteed. In this special series, we follow China's "blue helmets" as they step into some of the world's most fragile front lines. From helicopter pilots skimming treacherous night skies in South Sudan, to medics bringing hope to remote villages where supplies are scarce, their stories reveal courage, sacrifice and resilience. Through these missions, China's evolving vision of security comes into focus – one defined by humanitarian aid, cooperation and a growing contribution to global peace.