Remember when Korean beauty was about one step: the BB cream? I certainly do. Around the same time Psy’s “Gangnam Style” pervaded YouTube and radio, the BB cream introduced most Americans to the boundless inventiveness of Korean beauty. (Let’s ignore the part about a German derm originally formulating BB.) These days, it seems like new Korean imports – essence serums, sheet masks, cleansing sticks and so on – are inundating U.S. beauty aisles. But BB cream remains unmatched. Whether its acronym stands for beauty or blemish balm, the comprehensive product did something very un-Korean to beauty routines: it eliminated steps by hydrating, covering, brightening, moisturizing and protecting.