Likely the most well-known Korean tea brand, the tall O’Sulloc building across from Ssamzigil on the main street of Insadong is hard to miss. Not only can you buy a whole wide range of teas on the first floor, you can also order a beverage and drink it on the third floor. The spacious seating and the large plush seats make it a great place to enjoy a drink or a dessert from the first floor. (During the summer, the green tea ice cream is delicious!). Take a seat by the window for some fun people watching.