Modern history PhD Lin Xiao and live-streaming host Su Da unexpectedly travel through time to the Republic era, becoming the warlord mansion's prospective second wife and ninth concubine respectively, and get dragged into a death trap of being buried alive with the dead after seven days. To save their little lives, the best friends decide to win over Young Marshal Shen Hanqing and security commander Shen Rongmo, but accidentally disrupt the power structure of the warlord's mansion. As the fake-dead warlord, stolen firearms, North-South power struggles, and the mystery of Lin Xiao's identity surface one after another, the four go from probing each other to breaking the deadlock side by side. Amid turbulent times, they expose conspiracies, guard the northern border, and harvest their own love and ultimate destination.