The mother died and the alarm was restarted. Gu Nianchu inherited the legacy and became the "Nightingale". Chen Xubai, who had been rescued from the abyss by her in high school, followed her light and embarked on the same path. They were comrades-in-arms, the only sparks in each other's dark lives, and until the end, their names were engraved on the cold tombstone together, becoming codenames that would never fade away.
Very nice and well written