By chance, Vincent (Fan Shang Makenie Vincent Macaigne) meets a woman named Mona (Goshfi Farahani Golshifteh Farahani). Vincent aspires to be a film actor, but now he can only make a living by playing the role of a dragon in the film. Mona is a foreign immigrant who sells sandwiches at the Paris train station. The sparks of love soon collided between the two small potatoes at the bottom of society, and soon they came together. The happy days didn't last long, and Vincent discovered Mona's strange behavior. Every night, she secretly went to prison alone. To this puzzled Vincent can only turn to Mona's good friend Abel (Louis Carell Louis Garrel) for help, which unexpectedly broke through the amazing secret Mona tried to hide.