Why did men in ancient Korea wear cloth strips on their foreheads?

This is called "smoothing". After marriage, ancient Korean men combed their hair, tied a bun on the top of their heads and fixed their hair with a trowel. Unmarried young men's hair is braided and drooping, a bit like the hairstyle of the Qing Dynasty, but they don't shave their heads. Change your hair style on the wedding day, similar to the ceremony of men's weak crown in ancient China.