Native Title	은수좋은날
Also Know as	Eun Su Good Day, Eun Soo Good Day, Good Day for Eun Soo, Eun Su Joheunnal
Director	Song Hyun Wook, Park Hyun Suk
Writer	Jeon Yeong Sin
Distributor	KBS2
Air Time	Saturday, Sunday 21:20
Content Rating	15+ - Teens 15 or older
Runtime	12 episodes
Genre	Thriller, Crime, Life, Suspense
Language	Korean
Country	South Korea
Release Date	2025-09-20
End Date	2025-10-26

“Walking on Thin Ice” (Korean: 은수좋은날) is a 2025 South Korean crime-thriller series set to premiere on KBS2 on September 20, airing Saturdays and Sundays at 21:20 KST. Directed by Song Hyun-wook and written by Jeon Young-shin, the show is produced by Baram Pictures and Slingshot Studio. The series stars acclaimed actors Lee Young-ae, Kim Young-kwang, and Park Yong-woo, anchoring a tense narrative of ordinary lives pushed to extremes.

Plot Synopsis

Kang Eun-soo (Lee Young-ae) leads a seemingly peaceful life as a dedicated housewife, raising her daughter while caring for her terminally ill husband. As medical bills mount, her world is thrown off balance when she discovers a suspicious bag of drugs left behind by chance. This unexpected discovery entangles her in a dangerous spiral of crime and moral compromise.

Her path crosses with Lee Kyung (Kim Young-kwang), her daughter’s art teacher by day and a methodical drug dealer by night. The two form a hazardous alliance as desperation drives Eun-soo deeper into the underworld. Meanwhile, Jang Tae-gu (Park Yong-woo), a relentless detective, closes in with unwavering resolve to uncover the truth.

Cast & Characters

Main Roles

Lee Young-ae as Kang Eun-soo: A devoted mother and wife thrown into chaos, balancing fear and fierce protective instincts.
Kim Young-kwang as Lee Kyung: A teacher living a double life – calm and reliable in the classroom, cold and calculating in the underground.
Park Yong-woo as Jang Tae-gu: Seasoned detective hell-bent on bringing the drug ring to justice, even if that means confronting Eun-soo.

Supporting Roles

Bae Soo-bin as Eun-soo’s compassionate but dying husband, Park Do-jin
Kim Si-a as their daughter Soo-ah
Jo Yeon-hee (a strict law professor friend), Hwang Jae-yeol (Detective Park), and others enriching the personal stakes around Eun-soo.

Reception

Teaser Sparks Major Buzz

Since the teaser dropped in early August, the drama has generated significant buzz – especially for the palpable chemistry between the two leads and the morally complex premise.

Lee Young-ae's TV Comeback

Lee Young-ae, making a highly anticipated return to television, expressed motivation in the story’s emotional and social weight: “I hope this becomes both a new milestone for KBS dramas and personally for me.”

Navigating Complex Tonal Shifts

Lee Young-ae acknowledged the challenging tonal shifts as her character morphs from nurturing to deadly serious, showcasing the role’s intense emotional range.

Early Ratings Outlook

Even ahead of its premiere, industry watchers expect strong performance thanks to its weekend prime-time slot and high-profile cast. Domestic ratings forecasts suggest the drama is poised to debut in the 5–7% range.

Fun Facts & Highlights

Lee Young-ae’s Comeback

Her first leading role in years, and she tackled rigorous emotional shifts and action sequences with dedicated physical training.

Dual Identity Theme

The central motif reflects in Kyung’s double life – a gentle teacher masking a criminal alter ego.

Evocative Poster Imagery

One poster shows Kang Eun-soo and Lee Kyung running hand in hand under ginkgo trees – symbolizing both unity and the collision of hope with danger.

Social Commentary Through Tone

While dealing with weighty themes of desperation, illness, and survival, the show balances gravity with engaging suspense under Song Hyun-wook’s direction.

Final Thoughts

“Walking on Thin Ice” offers high-stakes drama powered by moral conflicts and relatable human urgency. With beloved actors Lee Young-ae and Kim Young-kwang at the helm, supported by a tightly wound premise, the series promises to deliver suspense, empathy, and hard questions about how far we’d go to protect the ones we love.