SPF-18 is a coming-of-age romantic comedy film in which Noah Centineo plays the role of Johnny Sanders Jr. The story revolves around a group of teenagers spending their summer in Malibu, California. Johnny, a talented musician, forms a connection with Penny Cooper, a girl who is visiting her aunt. As the summer unfolds, the characters navigate love, friendship, and self-discovery. Noah Centineo's portrayal of Johnny brings a sense of charm and vulnerability to the character, making him relatable and likable.