Hongdae is the area in front of Hongshik University known for its youthful ambiance. People in their 20s and 30s usually hangout here. Hongdae is popular for its cafes, clubs, wall murals, fashion, music and art festival.
This area is always packed with people and excitement. Idols usually do street performances here too. If you're lucky enough, you might pass by one while strolling around.
here's Crystal Clear or CLC, a newly debuted girl group form Cube Ent.
If not in the streets, they might be at a club. Epik High is one that I know of who performed to such. Here's Epik High performing Don't Hate me at a club in Hongdae.
There are also special streets in this area such as ateliers' street which is for art students preparing for university entrance exams, Picasso's street and Club Street.
You'll surely enjoy to walk through Hongdae! Visit Korea Tourism Organization to get to more of Hongdae.