It's Mise-en-scène serum.

It is Mise-en-scène Perfect Styling Serum.

I was debating between this and the original serum, but since I use a hair iron occasionally, I bought and am using the styling serum.

On rainy days, my hair tends to be particularly unruly, turning into a lion's mane, but using this serum seems to calm it down a bit, so it is a must-have item during the rainy season.

I'm planning to buy the original next time!