I rode the GTX for the first time

I don't like public transportation and usually only drive,
but since my driving time was a bit awkward, I tried the GTX for the first time.
Aside from the high price, it's amazing.
Why is it so fast?
It probably needs to get a bit cheaper lol
If you ride it expecting the subway, it's quite a burden for public transit.
And why are the stations so deep? ㄷㄷ I don't think I've seen anything this deep since the subway in Yeouido.