SF Express. Li You, founded on 200 1, is a brand of dapu county Blue Love Clothing Co., Ltd., referred to as LY. Ly official website SF Express. SF Express is an integrated express logistics service provider in China, headquartered in Shenzhen. After years of development, it has initially established the ability to provide customers with integrated logistics solutions, not only providing logistics services at the distribution end, but also extending to the production, supply, sales and distribution links at the front end of the value chain.