William Wei (also known as Wei Li-an, simplified Chinese: 韦礼安; traditional Chinese: 韋禮安; pinyin: Wéi lǐ-ān; born 5 March 1987) is a Taiwanese Mandopop and folk-rock singer-songwriter. He gained media attention as the winner of the first season of the reality television singing competition in 2007.

After signing a contract with , Wei released his debut EP Slowly Wait (慢慢等) in 2009. The following year, Wei released his eponymous debut album William Wei (韋禮安首張同名全創作專輯). He received 4 nominations at the 22nd Golden Melody Awards and subsequently won Best New Artist.

Wei released his second studio album Someone Is Waiting (有人在等) in 2012 and his third studio album Journey Into The Night in 2014. The latter received 2 nominations at the 26th Golden Melody Awards and the lead single 'Wolves' (狼) won him the Best Composer Award.

On 12 September 2015, Wei held his concert, "Free That Girl", at the Taipei Arena for the very first time.

Wei grew up in Taichung, Taiwan. His parents, Wei Chin-long (韋金龍) and Chen Yu-mei (陳玉美), were both professors in the foreign languages departments of National Chung Hsing University and National Chung Cheng University respectively.

Wei's grandfather was a songwriter and both of his parents were previously choir members. Wei grew under their influences and has developed great sensitivity toward music. However, Wei did not pick up any music instruments when he was a child as he felt it would be tiring. Instead, Wei enjoyed drawing and wanted to become a comic artist when he grew up.

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