That should be some kind of bonsai exhibition even though some of the plants did not look like bonsai to me. Looking at the effort and time taken to come up with these pieces of art, the artists must have a high level of patience. Not only that, these plants need a lot of tender loving care all year round or else they would surely wither and die.
I don't think I could be a good bonsai owner. I just prefer the plants that are more independent - the ones that could survive the hot sun with very minimal care.
There is another section of exhibition at Incheon International Airport. It is a brilliant idea to have this kind of thing at the airport as it should benefit travelers who have a lot of time to kill while waiting for their flights.