MADAM CHUNG KHIN CHUN
The woman at the heart of the saga is 89-year-old widow Chung Khin Chun, who was diagnosed with dementia in 2014. Her assets, which include a Gerald Crescent bungalow off Yio Chu Kang Road, are estimated to be worth $40 million.
The 42-year-old former tour guide is being accused of manipulating the elderly widow into handing over her assets. In a 2010 will, Yang Yin stood to inherit all of Madam Chung's assets. But a new will recognised by the courts will leave most of her assets to charity, and nothing to Yang. His wife and parents are also defendants in the civil suit.
MADAM HEDY MOK
The case unfolded in 2014 after the niece of the wealthy widow, Madam Hedy Mok, a 62-year-old tour agency owner, commenced a series of legal actions against Yang.
MADAM CHANG PHIE CHIN
The retired teacher has known Madam Chung and her late husband, Dr Chou Sip King, for more than 50 years. Madam Chang Phie Chin, who is now 86, lived with the couple in their Gerald Crescent bungalow after Dr Chou's health deteriorated. She moved out in 2011.
MR PETER DORAISAMY
The lawyer from Selvam LLC represents Madam Mok in the High Court civil suit.
MR IRVING CHOH
The lawyer took over the civil case for Yang Yin from Mr Joseph Liow in April. He is the founder of law firm Optimus Chambers.
MR WEE PAN LEE
He acts for Yang in the criminal matters.