Son Byeonguk Bakery is an old bakery in Imdang-dong, Gangneung. It offers many kinds of castella, including spinach castella and banana castella, and the garlic bread contains a tangy cream. The spinach castella shows the shape of spinach, and the cream inside the baby choux is also tangy. For breads with fillings, such as koroke, the filling is disappointing.