The Singaporean singer-songwriter is in quarantine for five days following his flu infection, and is forced to cancel his concerts.

JJ Lin is down with H1N1 flu.

The Singaporean singer-songwriter, who's currently based in Taiwan, was diagnosed with the flu virus yesterday after he was warded into Taipei Medical University Hospital with a high fever of 39.5 degree Celsius.

JJ had apparently worked overnight for his MV and had already shown signs of fatigue just the day before. He was also plagued with fever and flu since his flight back to Taiwan on Sunday after his concert tour in Nanjing, China.

After taking his blood sample, JJ was confirmed to have H1N1 flu. As the virus spreads rapidly, he is required to be in quarantine for the next five days.

As a result, the 29-year-old had to cancel his flight to Hefei, Anhui China, and the concerts lined up till Monday. The cancellations will cost him RMB1.5million ($300,000).