The eight-character bangs disappeared as soon as they slept.

The eight-character bangs disappeared after a sleep because they were cut too little. The bangs are cut too little and too thin, which is easy to hide in the hair seams. You can use a comb to turn the whole head upside down, comb it again, and slowly see some fine hair. That's your splayed bangs. If you really can't find it, you can cut it thicker.