Woon Swee Oan (born Woon Liang Giok in 1954), also known as Wen Rui'an, is a Hong Kong-based Malaysian Chinese poet and writer of wuxia novels. Some of his best known works include Jingyan Yi Qiang, Buyi Shenxiang, and Si Da Ming Bu, which have been adapted into television series The Four and Face to Fate, and the film The Four, among others.

Woon was born in Bidor Town, Batang Padang District, Perak State, Malaya in 1954 in a Hakka family with ancestry from Mei County, Guangdong Province, China. In 1959, at a young age, he started reading from his family's collection of books and wrote his first short story. In 1961, he started attending primary school, and was accompanied by his elder sister because he was shy and afraid. However, soon after entering school, he became very active and outspoken in class, and was selected as the model student of the year in 1963. Throughout his years in primary to senior high school, Woon published articles in various magazines and defeated an opponent a year older than him in a debating competition when he was in secondary two. He also wrote a romantic novel titled Ouran (偶然; By Coincidence).

Between 1971 and 1972, Woon studied psychoanalysis and aesthetics. During this time, he met Fang E'zhen (方娥真), who became his partner for 16 years. He also started writing for various Taiwanese magazines and published his debut wuxia novel in the Hong Kong magazine Wuxia Chunqiu (武俠春秋). In 1973, he established a poetry society and published his first novel in the series Si Da Ming Bu (四大名捕; The Four Great Constables). At the end of the year, he travelled to Taiwan to further his studies at the National Taiwan University.

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