On the other side of ODD EYE CIRCLE, Heejin stands directly at the angle 90º. She lives in a world of black and white (opposite colored ODD EYE CIRCLE). 

Her life seems resembling Cinderella, her routine is cleaning and dusting with stepmother (or stepsister) commanding her all day long.  

The caption "Je voudrais nettoyer. Il existe des outils la-bas" translates "I'd like to clean. There are tools (broom & feather duster) over there."

The French language indicates her current position is in the real world (France) as ODD EYE CIRCLE exists as its alternate. I wouldn't say Earth because it has 3 moons (ODD EYE CIRCLE) instead  of one.

Remember, we're in LOOΠΔVERSE now. Let's say this 'real world' resembles Earth, so for now I'll call it LOOΠΔTION. 

Heejin's daily routine is cleaning, cleaning and more cleaning. Sometimes, she practices magic tricks to pass time but sooner or later she grows tired of it. 

Starting from the morning, it's already déjà vu

Unfamiliar but the same day

Should I hide? Should I run away?

I'm thinking

I rummage through the black hat

But I always get the same thing

Either a white rabbit or a dove

That's all same

Happy ending, the same ending

Me without you, so what can I do?

A repertoire that's nothing special

Stop with that now

While cleaning the place by herself, she discovers a secret room. The room places mirror inside that reveals a view of the other side. 

She sees ODD EYE CIRCLE on one side and ViVi on another (dark side of the mirror), naming it ViViD. 

The name of her solo track is written as ViViD, not the usual Vivid. This word is a combination of ViVi and D (the shape of a half moon/ODD EYE CIRCLE). Yves is not visible since she's currently out of Heejin's range and ODD EYE CIRCLE.

ViVi + D = ViViD

Fascinated by the colors, she tries joining ODD EYE CIRCLE by finding a way in (running around the three moons in LOOΠΔTIC) but failed. 

Color me with many colors

Oh my god yes!

Say, oh my goodness!

I want to walk on like a runway

I'll be different, look at me differently

I'll show myself to you

I can see the shining moon above

OMG! We're going round and round, don't fall!

P-R-E-T-E-N-D to be mad

I don't really care now

The moon Jinsoul referred to is Heejin. Considering she stands directly on y-axis, like the Earth's moon she separates the bright (day) side and dark (night) side. 

Devastated by the rejection, Heejin flips the mirror. The color reflects to her side and ODD EYE CIRCLE turns into black and white. Heejin gains her new color (bright pink).

Same color, say, different color?