Yi Mei had acted for and assisted in various criminal litigation matters, ranging from Penal Code offences to regulatory offences.
She assisted in a High Court Trial followed by an appeal to Court of Appeal for an offender charged with an offence of culpable homicide – Public Prosecutor v P Mageswaran  SGHC 307, on appeal in Public Prosecutor v P Mageswaran  SGCA.
In Public Prosecutor v Praveen s/o Krishnan  SGDC 190 and on appeal in Praveen s/o Krishnan v Public Prosecutor  SGHC 324, Yi Mei had successfully obtained probation for a young offender who had been convicted of drug trafficking.
She has also successfully obtained an acquittal of an accused charged with 2 counts of drug trafficking inPublic Prosecutor v Mohamed Amir Khan s/o Banakhani Shafi Khan  SGDC 196.
In Public Prosecutor v Luo Jianguo and Zhou Haiming  SGDC 126, on appeal in Zhou Haiming v Public Prosecutor and other appeals  SGHC, Yi Mei acted for an offender involved in the first case in Singapore involving theft of casino chips amounting to over S$100,000.