Repurchased Ryeo Heukwoon Root Strengthening & Volume Shampoo

My hair was limp and flat, so I was looking for a shampoo with good volume and ended up buying and using this. Since using this product, I'm not sure if the volume lasts for 24 hours like in the advertisement, but I am satisfied because my hair seems to have gained some volume. It is mild because it is a slightly acidic product. I was almost out of one bottle, so I bought another one when the supermarket was having a 50% off sale.