Ai Lvete, a Eurostar crew member, secretly fell in love with the aloof high-speed train driver Marco. By chance, they got acquainted on an anonymous app and quickly fell into a passionate love. Ai Lvete gradually discovered that Marco was actually the heir to the transnational mafia Valeri family, using the train routes for smuggling and criminal activities. Ai Lvete was caught up in the family feud and the invasion of rival gangs, and was also recruited by the police as an informant. When the heist in the last train tunnel broke out, the two stood side by side to fight against the armed gangsters. Marco finally woke up and chose to testify against his family's crimes in exchange for Ai Lvete's safety. After shedding his identity and the darkness, Marco washed away his worldly splendor and rushed to a seaside town to be with the reclusive Ai Lvete, finally finding a peaceful end.
