The symbolism in this video 
This is copied from a YouTube comment in the video:
the story & symbols of this mv explained:
0:07 - their debut date is the license plate of the car, so the car ride basically represents their journey as singers. (we can also see "brave girls" and their fandom name written on the license plate at 2:32)
0:40 - all the girls start off looking pretty serious/gloomy as eunji sings "our laughter dried up, being together is uncomfortable now", probably representing how they started feeling after they felt that they weren't going anywhere in their careers.
1:11 - the girls are shown much happier on the tv screens which represent their fantasy life where they're shooting commercials, but it's clearly not reality since we can see how obviously fake the backdrops are.
2:01 - a crossroads sign appears, signifying that they have to make a choice in their journey.
2:53 - their cars flies into the sky with stars (because they wanted to be stars). 3:07 - the tv screen says that they won #1 on the weekly music show and there's stars in the background.
3:10 - but right after, in "reality", we see that there's no one actually left in the car and it fades to black, suggesting that the girls decided to give up on their dreams of being a singer. and ending credits roll to really nail in the point. When this song was released, they were thinking of disbanding so you can see this mv kind of served as a goodbye message.
The way I totally didn't notice any of this when the song first came out 
It hits different now that they've actually achieved what they thought was impossible. icyruios
