When I tell you the nightlife scene in Seoul South Korea is Top 5 of all countries I have been to... I MEAN IT. I was only there for 24 hours for a overnight layover, but I had the time of my life.
I landed at 12 am and got to the Hongdae (the nightlife area) around 2am. I didn't get back to my hotel until 10 AM.
If you like the nightlife scene South Korea is a place you have to add to your list.