Former bomb disposal expert and his fiancée board a high-speed train. Also, a well-known physics teacher who was involved in an affair scandal, also boards the same train in order to win back his wife. At the same time, there's a bomb on the train!

Hsiao-lee, a young girl, finds solace in her friendship with Li-li, who embodies the dreams Hsiao-lee had suppressed. However, Hsiao-lee's aspirations are challenged by her mother's past, which mirrors her own struggles and traps her in a cycle of despair.

In 2006, Detective Chang leads a police investigation into a murder committed in a public marketplace. Chang discovers the victim's father has ties to several other families with dead or missing members, and a grim espionage case buried for 50 years in Taiwan's past. Meanwhile, the kidnapped Mr. Hsu is interrogated by a mysterious mastermind. As the truth emerges, the embers of history become a deadly wildfire.