Modamoda Gray Hair Care Darkening Shampoo

Many of you know Modamoda, right?

As far as I know, this shampoo was created by a KAIST professor. I bought two; one is almost finished, so I took a picture of a new one and uploaded it. It has a large capacity, so one bottle lasts a long time, but the scent isn't very good. I'm using it because I have a lot of gray hairs in my bangs, and after using about half of it, the gray hairs started turning brown. You can still tell it's white hair, but it's less noticeable than completely white hair.

When I dye my hair with regular dye, the roots grow out quickly and it becomes noticeable, but since I shampoo this every day, I don't have that problem. However, I don't really like the smell of the shampoo; it has a stale scent.