The concept is interesting and the actors are all great, but this movie should have 1 story. The issue with Wonderland is trying to present too many stories instead of focusing on one.
I particularly only cared about the couple story. The idea of Tae Joo waking up and Jeongin having to deal with the not so perfect reality while not wanting to let go of Wonderland Tae Joo was the best part of the movie. Two hours developing that story would make the movie so much better. But I would understand the movie also focusing only on the mom/daughter/grandmother story. That version could also feature a bit of the Wonderland employees, maybe just not trying to pull their family into the story too.
The other small Wonderland plots only waste time and don’t give us anything special.