Ciize Rutricha Phapakithi is a Thai actress. In 2022, Ciize received a bachelor's degree in Chinese for International Trade from the Chinese International College at Bangkok University. Her nickname, Ciize, comes from the Chinese "Xi Shi" (张西施 ), one of the legendary Four Beauties. Her father chose it to influence her to grow up as beautiful as the Four Beauties. Her younger sister, "Cherry" Phitsinee Saejung (or Cheriie) is a singer under the label Labo.

Since she began in the entertainment industry in 2015, Ciize is a talent under GMMTV. She was previously the main dancer of the project girl group SIZZY (ซิสซี่; formerly SISSY) formed by GMMTV in 2019. In 2023, they signed with Riser Music although they never released music under the label, ultimately disbanding on October 16, 2024. On July 6, 2023, Ciize changed her name to Rutricha Phapakithi as someone else shared her exact birth name.