So I just stumbled across this subbed clip where the interviewers polled a number of viewers and the production crew answered a few questions that they (we) all have.
#1: Where is Do Min Joon's planet in actual fact?
Well, in reality, KMT 184.05 doesn't exist. It's a made-up name where KMT stands for the name of the telescope and the numbers stand for stars which the telescope has discovered.
#2: Did the UFO really appear in ancient Joseon times?
Apparently, there is concrete evidence detailing sightings of UFO way back in Joseon times. So yes, there's very clear support.
#3: How did they film the scene where the UFO was sighted?
Uhmm….instead of a UFO, they shot the scenes with a helicopter, so everyone would look at the helicopter and pretend that they saw a UFO. HAHA.
#4: How did they film the stop-motion scenes?
Wow, this is really amazing, they use 60 cameras to capture the scene and when they overlap the film together, it will look like everything has stopped.
Other interesting facts:
#5: Do Min Joon's library is a real set, with all props carefully chosen by the team. That is crazy effort omygosh. The grandfather clock is also said to be one of the only three in Korea (and costs a bomb).
#6: The beautiful scene outside the balcony? Haha, that's fakeXD
The video was quite informative and funny. If you can understand chinese subtitles, I definitely recommend that you watch it! http://www.iqiyi.com/v_19rrgyh1lg.html
I think at this point it is obvious I'm in love with the show. Some people may be quite cynical with the plot and all, but hey, you got to acknowledge the great effort and thought that the team has put in. I can't wait to discover more behind the scenes videos!:D