30-year-old Irina is a flight attendant on intercity bus routes. Anton's ex-husband left her immediately after the birth of his son Grisha, finding a more profitable option in the person of the naive Alina. The girl keeps Anton, taking money from her mother Lisa.

Lisa is the daughter of furniture mogul Viktor Romanenko, who is looking for a male heir to hand over his business to him after his death. Romanenko hardly communicates with his daughter and granddaughter, but remembering that Alina was pregnant four years ago and was expecting a boy, she decides to make him the heir to the empire. The man should not find out that Alina had a miscarriage then. Lisa conspires with Anton – now they intend to deprive Irina of parental rights and take away her son, giving Grisha as Romanenko's heir.