Madrid, 1880. Elena Bianda is the most sought-after lady-in-waiting in the entire city. Despite her youth, more than 20 ladies have already had decent courtships and courtships under her tutelage. Her success lies in being rigid in morality with their families and sensitive to the concerns of the ladies. A complicated balance that Elena handles perfectly. She was born for it: seeing them successfully walk down the aisle is, quite simply, her whole life. All this changes when she arrives at the Mencía house and has to take care of 3 sisters.