Can Joseph's hangover be changed?

You can't. As of September 9, 2022, according to official website, the fifth personality, Joseph's hangover skin belongs to limited purple leather, which cannot be exchanged with scraps. The Fifth Personality is an asymmetric competitive game developed by Netease. The limit test of the game began on April 2nd, 20 18, and the public beta of the whole platform began on April 2nd18.