similar in this two drama- the main male lead is a Prosecutor,
Investigation,
hacker,
find out the truth,
some people want to take revenge,
so much corruption,
people don't get proper right,
cover some wrong doing,

in class of lies , Main lead is a attorney and he is a successful lawyer. but he falls from grace because of one case. he changes his identity and will be find out the truth behind that case.

in Room No 9 , Main female lead is a attorney and she is a successful lawyer. She goes to meet with Jang Hwa Sa, who is on death row for an infamous case of poisoning serial murders. Inside Room No. 9 of the high-security women’s prison, the souls of Hae Yi and Hwa Sa change bodies. then the attorney's body, she hides her identity and find out the truth behind her case .