During more than ten years together with his boyfriend William, they have experienced all sorts of gay lovers 'arguments, union and separation, waiting, and even one period when they were on the verge of a break-up. So he used the affection between him and his boyfriend to shoot a true-to-life Lan Yu which reflects a higher level of romance.
關錦鵬自己也坦承，《藍宇》是他的自傳式電影，他與男友威廉在一起十幾年，種種同志愛侶間的爭執、離合、等待、一度走不下去幾乎分手的歷程，他們都曾經歷。所以他以與男友間的情誼拍攝生活化的《藍宇》，反映愛情中純度更高的層面。