Please recommend a restaurant in Hongdae that is p...

If I had to pick three local restaurants in the Hongdae area, I would recommend these. There are actually many more good places if you look beyond just the main street of Hongdae to areas like Yeonnam-dong and Hapjeong. First, there's Okdong Sik, which is in Hapjeong. Their pork bone soup is really clean and it's great for solo dining without feeling burdened. The second is Tuk Tuk Noodle Thai, which is a popular spot in Yeonnam-dong when you want Thai food. If you like pad thai or curries, you'll be generally satisfied. If you want to eat Korean food comfortably, go to Okdong Sik, and if you want a bit of atmosphere, I recommend Tuk Tuk Noodle Thai.