South Korean actor Kim Mi-soo, who featured in a supporting role in the currently on air K-drama Snowdrop, passed away on Wednesday. She was 31.

The Landscape Entertainment agency confirmed the news of the actor’s sudden death in a statement to Korean media outlets. The cause of death has not yet been revealed. “Actress Kim Mi Soo suddenly passed away on January 5. The bereaved family is currently heartbroken due to the sad news,” Kim’s agency said. The agency also urged people to refrain from spreading rumours around the actor’s death.