A charmly naive Mr. Case appeared at BJL4 Zhongguancun station on August 25 guiding passengers with large luggage to take lift. Volunteers from www.ditiezu.comwearing T-shirt of this theme distributed leaflets to advise passengers to take lift when they have large luggage with them. This approach helps to create a safer environment for the metro travel. At the site, staff use a hot computer game modified to suit the theme to promote the awareness of this in the funny interactions.