A spooky film poster showing a ghost on an underground train has been banned from MTR stations for fear it might frighten commuters. The advertising campaign is for the forthcoming movie Visible Secret by award-winning director Ann Hui On-wah. The poster features a pale-faced ghost dressed in a black cheongsam with a red umbrella - an image inspired by the Chinese paper doll used for burning at grave-sweeping rituals. The ghost, played by actress Guk Jo-lam, is pictured sitting between cast members on the MTR. MTR spokeswoman May Wong May-kay said the decision to ban the poster was made by its advertising agency based on guidelines which state that advertisements that offend commuters should be rejected. 'We have to make sure the guidelines are upheld given the vast number of MTR passengers. We don't want to offend the public.' Hui was unavailable for comment yesterday. The film, due for release in June, tells the story of a nurse whose right eye gains the power to connect to the spirit world following a traffic accident.