6 nab reki Moyki
St Petersburg, Russia
Санкт-Петербург, наб. реки Мойки, 6
There are several Korean restaurants in St Petersburg but Shilla is the most central (less than a ten minute walk from the Hermitage). They offer lunch specials for 200 rubles and their prices for dinner are also reasonable. The owner came to St Petersburg from Seoul, fifteen years ago to study music at the Conservatory.
Below is a photo of the japchae lunch which is about 200 rubles.