Efimova/Korovin relocated to Saint Petersburg to be coached by Oleg Vasiliev and Tamara Moskvina. In September, the pair placed fifth at their season opener, the 2017 CS Lombardia Trophy and then won bronze at the 2017 CS Ondrej Nepela Trophy a week later. In November, they took silver at the 2017 CS Tallinn Trophy behind Australia's Ekaterina Alexandrovskaya / Harley Windsor. They had no Grand Prix assignments. They finished ninth at the 2018 Russian Championships.