Now this was cool. A must go. (& free!)
We first started by getting wristbands that guided us through the exhibition. Then we took a picture and put in our names so the machines could talk to us and use our faces. There were a bunch of different stations where we got to imagine our future and choose different things and the machines calculated our personality traits and lives. 
The emotions they gave me, which led to my bright future as a Martian Navigator. How did they know?!?!
I didn’t take pictures upstairs, but the 2nd floor was set up as a house of the future. I attempted a couple times to explain what that looks like but it kinda sounds crazy. You’ll have to go and experience it yourself! Or wait 50 years and experience it in your own home. This is when it got pretty creepy.
Found it online here, with the directions: basically get off Gangnam station and take exit 8 and you’ll see it right when you get off!
https://www.myguideseoul.com/things-to-do/samsung-d-light