20u hair salon hongdae sits between Hongdae and Sangsu and does balayage, sombre, ombre, highlights, and cuts. Coloring ranges from natural tones to green, fake black, and bridge points, matched to the look the client wants. Before a service, the stylist consults on the hair's condition and the desired design, then proposes a color suited to the client's personal color along with several options. The stylist's proposal is adjusted to include the style the client wants.