When I was younger and suffering acne, all the products that described themselves as purifying tended to be irritating to my skin as well. Also, many of them made minimal difference. I'm now in my 40s and still get a LOT of clogged pores and blackheads, but my skin is even more prone to irritation and does not recover from bad products so quickly. This product is probably the first product I have tried that really feels like it purifies (I could can even see the stuff in the blackheads all come to the surface the first time I used it!) AND it manages to be soothing at the same time. And the foaming action when you wash it off feels deliciously luxurious. The only possible drawback I can think of is that the instructions on the back are all in Korean, which looks pretty cute, but I cannot read, so I had to check the website for English instructions the first time I used it.
Don't be deceived by the cheap price, this one is quality.