I recommend Ryeo Shamchu hehe

Since I have straight hair, it gets instantly unruly during the rainy season! I love Ryeo shampoo because I want my hair to have even a little bit of volume from the scalp. There is a subtle difference between using it and not using it! Ryeo shampoo is famous, so I'm sure everyone knows it, but it's really good! I highly recommend Ryeo shampoo. The subtle volume is the best.