Liu Hai, also known as "Liu Haier" and "Liu Hai Er Fa". Refers to short hair that hangs over the forehead. There are different versions of the origin of this name. You can also refer to the hairstyle featuring Liu Haier, which can be divided into three types: uniform bangs, oblique bangs and ultra-short bangs. People call people's short hair hanging on their foreheads "bangs".