I was disappointed, also. Not much hydration, feels a lot like plain water.

I have a full review here: Beauty of Joseon Ginseng Essence Water – The One I Didn’t Like

I recently finished the first bottle of this essence but I don't see any massive change in the brightness of my skin and moisturizing effect.
it's also quite weird bc it makes my skin feel somewhat dry. I think I would prefer other essences because this one is not moisturizing enough.