Walking on Thin Ice

Eun-soo faces the looming threat of losing her home after her husband's investment fails. To make matters worse, he is diagnosed with cancer, shattering their once-peaceful life. In the midst of the chaos, Eun-soo stumbles upon a drug bag left behind by the trafficking organization and steps into a world of crime. Eun-soo now finds herself torn between right and wrong, caught in a moral crisis.

A dangerous and desperate partnership begins between Eun-soo and Kyung. They start selling the product offline together to VIPs at the nightclub where Kyung works. Meanwhile, the police intensify their investigation, combing through the club district in search of the missing drugs and gradually closing in on Eun-soo and Kyung.

For Eun-soo, the need for money never stops. It's a relentless string of expenses with her husband's new treatment, her daughter's art class fees, and even unexpected home repairs. James finds out the source of the drugs Eun-soo brought and becomes furious. He tells her to give up all the drugs as it's dangerous, and Eun-soo feels like she's lost all her hope.

Lee Kyung challenges Eun-soo to earn 100,000 dollars within two weeks. Determined, Eun-soo ventures into online sales, but the reality proves far more difficult than expected. Just then, a mysterious buyer appears and offer to purchase the product, but only through a face-to-face deal. After much deliberation, Eun-soo decides to meet the buyer in secret without Lee Kyung's knowledge.

After finding Eun-soo's name on a burner phone, detectives Tae-gu and Kyung-do search her home but come up empty. Eun-soo masterfully plays the part of a devoted mother, but Tae-gu's instincts scream that something is dangerously wrong. Some secrets refuse to stay buried.

A violent attack on Eun-soo takes a horrifying turn when she recognizes one of the masked men as her co-worker, Dong-hyun. She and Lee Kyung manage to subdue him and his brother, but their desperate solution quickly unravels when the captives vanish without a trace. Now they know who she is.

Forced to pay a blackmailer an impossible sum, Eun-soo and Kyung must restart their dangerous business to meet the one week deadline. As they scramble for the money, they desperately hunt for the culprit who seems to be watching their every move. The truth is closer than they think.

The money-grubber is shockingly revealed to be Detective Tae-gu, who uses Lee Kyung's revenge plot to blackmail him into a corner. Now, Lee Kyung must force an unsuspecting Eun-soo to sell drugs to pay him off, causing Eun-soo's life to shatter. Some secrets are meant to be broken.

As Detective Kyung-do gets closer to the truth about the Phantom case, his own superior Tae-gu frames him as a corrupt mole. With his most dogged pursuer neutralized, Tae-gu now turns his attention to Eun-soo, ordering a rookie to tail her young daughter Su-ah. Now, everyone is a target.

Though Su-ah is finally safe, Eun-soo is immediately cornered by Tae-gu, who threatens to expose her daughter's crimes. With Do-jin also discovering her secret, a desperate Eun-soo listens as Lee Kyung presents a dangerous way out. Some offers can't be refused.

Waking up from a brutal attack, corrupt detective Jang Tae-gu discovers his world is collapsing from the inside. His own protege, Choi Kyung-do, uncovers the damning evidence that could expose everything, proving that the hunter has officially become the hunted. There is no one left to trust.

Facing a lifetime in prison, Kang Eun-soo is offered a dangerous way out by the police. She and her partner Lee Kyung must lure her husband's murderer, the fugitive Jang Tae-gu, into a deadly trap. But as she fights for her freedom, Eun-soo discovers the deepest betrayals come from those she once called friends. Some lines, once crossed, can never be erased.