f(x)'s Krystal is taking on a new acting project in the upcoming thriller drama "Mad Concrete Dreams," joining an ensemble cast led by Ha Jung Woo.

The drama recently released new behind-the-scenes stills showing the cast celebrating Im Soo Jung's birthday on set, with Krystal appearing alongside Ha Jung Woo, Kim Jun Han, and Park Seo Kyung. The photos capture a joyful atmosphere as the actors take a break from filming to mark the special occasion.

"Mad Concrete Dreams" tells the story of a struggling landlord who becomes caught up in criminal activities while trying to protect his family and property. Despite achieving his dream of becoming a landlord, mounting debts force him into participating in a staged kidnapping scheme that quickly spirals out of control.

This marks another drama project for Krystal, who has been steadily building her acting career alongside her music activities with f(x). The idol-turned-actress has previously appeared in dramas like "The Heirs," "Prison Playbook," and "Crazy Love."

While specific details about Krystal's role in the thriller haven't been revealed yet, her inclusion in the birthday celebration photos suggests she plays a significant part in the production. The drama appears to be in active filming, with the cast maintaining good chemistry both on and off camera.

Ha Jung Woo, known for his roles in films like "The Chaser" and "The Handmaiden," takes on the lead role in this thriller that promises to blend crime elements with family drama. The supporting cast includes experienced actors who bring depth to what appears to be a complex story about desperation and moral compromises.

No official release date has been announced for "Mad Concrete Dreams," but the ongoing production and recent promotional materials suggest fans can expect more updates soon.