Set in the 1990s, a metro tunnel foreman leads his crew deep underground while struggling to support his daughter’s dream of studying music. When the workers uncover a mysterious samurai sword during excavation, a series of eerie events begins to unfold. As Taiwan’s first female construction site supervisor fights to survive a male-dominated workplace, the project spirals into danger, illness, and hidden forces. Is the power buried in the tunnel a blessing—or a curse?