Starfield Library
Inside the Starfield COEX Mall is this amazing library. There were some international magazines at the entrance. Otherwise, most of the books were in Korean. You could pretend to read and take some selfies or just go straight to the second level where there's a cafe with mouth-watering cakes.
Note: my son told me that most of the books on the wall shelf were glued to the wall, therefore rendering the epic display in the pictures mostly fake. Don't ask him how he found out.
Gwangjang Market (광장시장)
Gwangjang Market (광장시장) is a popular shopping complex with many shops and street food vendors. The Netflix Street food shows featured quite a few food stalls in this market. We tried a few of them and were not disappointed.
ejang
If you are okay with sashami (raw fish), you can take a step further and try gejang, which is raw crab marinated with soy sauce. Make sure you ask for a bowl of steamed rice to go along with the crab. It's one of the tastiest snacks I ever had.
Besides street foods, this market was also famous for its apparel stores, especially those specialized for Korean wedding. It was said that you could buy everything you need for a Korean wedding in this market alone.
Myeong-dong (명동)
Myeong-dong is a major shopping district in Seoul. There are a variety of stores, restaurants, and street foods. You can easily spend a whole night (or two) there. While you are there, make sure you save some room in your tummy to try out Myeongdong Kyoja. Their dumplings and noodles were amazing even in the very high Korean standard.