Retired special forces soldier Chen Changan woke up in the bustling city of Chang'an during the Tianbao period. He wanted to find his way home peacefully, but he encountered the young ranger Li Mubai being surrounded and killed by the imperial army. After coming to the rescue, the two were forced to be involved in a conspiracy against the royal family. In order to find out the truth, they teamed up with the singer Cui Yuniang, but unexpectedly uncovered the biggest undercurrent on the eve of the Anshi Rebellion - someone was trying to tamper with the fate of the Tang Dynasty. Pei Twelve, who holds the military talisman, He Huaiying who hides his secrets, and Ashina Wusu, who is ambitious, appear one after another with their own agendas. Chen Changan uses modern tactics to solve the ancient dilemma, but finds that what really needs to change may not be history, but his own heart that just wants to escape.
