SINGAPORE- Former China tour guide Yang Yin has been slapped with another 15 charges - five for cheating, eight under the companies act and two for criminal breach of trust.

The 40-year-old, who has been denied bail and remained behind bars since Oct 31, now faces a total of 349 charges.

The fresh charges come on top of the 334 charges he faces over immigration offences and the falsification of receipts made to his company Young Music and Dance Studio. Yang had admitted to falsifying the receipts so he could stay in Singapore.

The saga started in 2008 when Yang acted as wealthy widow Madam Chung Khin Chun's private tour guide during her trip to Beijing.

A year later, he moved in to stay with the 87-year-old who has no children in her Gerald Crescent bungalow estimated to be worth $30 million.

He is also involved in a separate lawsuit brought by the widow's niece Madam Hedy Mok. She has alleged that the Chinese national had manipulated her aunt into handing over her assets worth $40 million.

Earlier this week, the court granted her permission to add his wife, parents and previous bailor as defendants.