TXT - Eternally MV Explanation

Section 2

Section 2 is called Star song.

After exiting the room, Soobin appears to be outside when a little boy runs towards him. This boy is Kai and he can see that because of the shoes the boy was wearing.

This could mean that Soobin had traveled back in time. He falls on his knees and starts crying when a woman, actually a ghost of a woman, comes to him and hugs him.
The inscription appeared between the clips that said:

"Tears always flow when I wake up from this familiar dream."

Could this be a dream?