Excellent product. However, it does not contain the same ingredient as the oft-compared SK-II essence (this product contains Saccharomyces Ferment Filtrate, whereas SK-II contains Galactomyces Ferment Filtrate - also known as Pitera).
If you are looking for an essence that contains Galactomyces/Pitera and is much cheaper than SK-II, you can look at Secret Key's Starting Treatment Essence (94% galactomyces) or at COSRX's Whitening Power Essence (95% galactomyces).

I don't understand the hype!! Or is it just me?? Read more at http://www.skbbi.com/missha-time-revolution-first-treatment-essence-intensive/ and do share your opinion!! I am curious!!