Tongin Sweet Cafe is a small cafe near Tongin Market in Jongno-gu, Seoul, selling egg tarts and coffee. Its signature egg tart has a thin, crisp shell filled with soft egg custard, and walnut tarts, chocolate tarts, and caffe lattes are also served. Orders are placed at the table by scanning a QR code, and seating and a restroom are on the second floor. Indoor seating is not large, and the egg tarts are sometimes not warm.