Gwei Lunmei Chinese 桂綸鎂 pinyin Guì Lúnměi born 25 December 1983 is a Taiwanese actress She started her acting career in 2002 with the film Blue Gate Crossing Gwei then appeared in a few more films before achieving wide recognition for the film Secret directed by Jay Chou in which Gwei played the character of Lu Hsiaoyu In 2012 Gwei starred in Girlfriend Boyfriend a comingofage drama in which three teenagers navigate their attraction to one another from their high school years into their adulthood Set partly against the Taiwans martial law period 194987 and partly against the newfound freedom that the onceoppressed protagonists are struggling to cope with the film charts the tortured emotional lives of its three characters played by Gwei Joseph Chang and Rhydian Vaughan over the decades