Core Viewpoint - The article discusses effective skincare products for brightening dull skin and reducing yellow undertones, particularly for individuals with irregular work schedules and sleep patterns [1][3][10]. Group 1: Product Highlights - Gu Yu Light Water is highlighted as a key product for brightening and repairing dull skin, featuring a proprietary whitening ingredient, "Aurora Licorice," which has shown an 86.62% inhibition rate of melanin after 72 hours [3]. - SK-II's "Little Light Bulb" is noted for its PITERA ingredient, which accelerates skin metabolism and helps remove old keratin, resulting in smoother and brighter skin [5][6]. - Lancôme's "Extreme Light Water" is praised for its unique water-oil layering design, which provides a refreshing feel and helps improve skin texture over time, making it suitable for oily and combination skin types [10][11]. Group 2: Application and Results - Gu Yu Light Water can be used for both daytime and nighttime applications, providing a protective barrier against oxidation and enhancing skin brightness [3]. - SK-II's product is described as having a lightweight texture that absorbs quickly, leading to a noticeable improvement in skin smoothness and brightness after consistent use [5][6]. - Lancôme's product is characterized by its gentle exfoliating properties, gradually removing dead skin cells and oil residues, resulting in a polished and luminous complexion [10][11].