Answer:
First of all, yay, second kpop stan that I've encountered. Hello, we both have taste.
Next,
1. I think that it's Jesus' resurrection. Everyone is bowing down and praying to him, because he is the messiah.
2. Everyone holding up the piece of land that he (Jesus) is floating upon. The bright light also signifies God in a way.
BTW, I'm not religious, so this could be wrong.