Self-straightening recommendation

I recommend this product for a DIY hair straightening session in the 10,000 won range. It's convenient and great because all you have to do is apply, rinse, and press (with a curling iron) after washing your hair. The capacity is generous, so I was able to complete the straightening process with just one bottle for my chest-length, thick hair. I was so satisfied that I bought another bottle immediately after using it!