Your Own Alien Sister (2006)

Anna, the wife of a successful businessman named Alexey, travels with him on a business trip. As the return day arrives, Alexey is nowhere to be found – not at home, not at work. His phone goes unanswered, and his colleagues are unsure of his whereabouts. While searching for him, surprising details about Alexey begin to emerge. It's revealed that Alexey, who presents himself as a devoted family man, has another woman and a daughter named Tanya living in a different city.