The world's 2nd largest smartphone manufacturer, Xiaomi, launched a new high-end smartphone series - Xiaomi 13 Series, produced in cooperation with the world's leading camera brand, Leica. To promote this new product line in the Vietnamese market, especially Xiaomi's camera technology, the Le Bros team conceived and implemented 3 campaigns with the concept of "An Sau Tuyet Tac" (Hidden Behind the Masterpiece), bringing not only the effects of recognition and revenue, but also cultural and spiritual values. The project included the Filter Campaign - Tuong Art photo series, "Forget-me-not", using Xiaomi's exclusive filter; Xiaomi x Leica Workshop event - 2 events to experience Xiaomi 13 Pro phone products in Hanoi and HCMC; and the campaign Before & Now Photo Album and Video - a series of photos and videos of famous places of Hanoi and Ho Chi Minh City in the past and present.