Walking on Thin Ice

Kang Eun Su has never dreamed of an extravagant life, simply wishing to be happy with her husband, Park Do Jin, and daughter. However, after Do Jin is diagnosed with cancer, Eun Su struggles to make ends meet with her part-time job as a supermarket cashier. Her life takes an absurd, dark turn when she accidentally stumbles across millions of dollars' worth of illegal drugs – and decides to sell them instead of reporting them to the police. Eun Su finds an unexpected partner in Lee Gyeong, her daughter's after-school art teacher, who moonlights as a drug dealer in the Gangnam club scene. But as Eun Su and Gyeong find success, the cops begin to notice, including Jang Tae Gu, the head of narcotics investigations, leading to dangerous choices and an uncertain future.

Walking on Thin Ice is about an ordinary wife who gets caught up in crime because of life’s problems. In A Model Family, a college professor ends up working for a drug cartel to save his family. Both are regular people pushed into dangerous situations.

Both dramas deal around two housewives that are confronted with a difficult situation and need money. They stumble accidentally across a situation where they are confronted with a solution to resolve all their financial problems. However in taking that solution they get intertwined with the world of drugs.
Both meet a male that they team up with to help resolve both their problems.

It's also a criminal story, there are several gangs, but instead of drug trafficking, there's gun sales. The atmosphere is very similar! In both series, Kim Young Kwang!

The series are very similar, not instead of the main character of a woman, here we have a man! He also gets involved in a criminal life, and the further he goes, the more difficult it is for him to get out! In both series, Kim Young Kwang!

TV series with similar atmosphere, gang nightlife, mafia, drugs and so on! Police work! There are great actors in both series!

Both dramas are done by the same screenwriter. In both dramas the "happy" life of the woman gets interrupted by something that has happened to her husband. She then teams up with the male lead to resolve the situation. Both male leads at some point are faced with similar situations where the police looks for them.
Overall although there are strong differences, such as the male lead working for the police in Lies within, while the ML from Walking on Thin Ice is involved with the drug world, they are having very similar situations and themes.

Both dramas deal around money/an object that brings a lot of money (drugs) and in both dramas specific people lose it, and are now willing to do anything to require it.