The young actress and model's passing at a tragically young age was confirmed in a statement from her agents translated into English by Joongang Daily and reported by Variety. There has been some discrepancy over her age, as some outlets have reported it as being 30 or 31, rather than 29.
Her agency Landscape said on Wednesday (January 5): "Kim suddenly left us on January 5. The bereaved are deep in their sorrow at the sudden sadness. Please refrain from reporting false rumors or speculation so that the family can mourn in peace."
Kim's death comes only a few weeks after the premiere of her latest K-drama Snowdrop in South Korea, set to be released on Disney+ in the UK and other international territories later in 2022.
She had a supporting role in historical drama Snowdrop opposite Blackpink star Jisoo as student activists at the heart of the true-life pro-Democracy movement in 1987 that would ultimately lead to the fall of the authoritarian Fifth Republic of Korea.
In last year's breakout apocalyptic Netflix series Hellbound, Kim also had a memorable turn as one of the members of the cult-like New Truth Society taking advantage of the public's fear of supernatural entities.
Her other notable work includes Netflix's The School Nurse Files, based on the acclaimed novel of the same name by Chung Serang.
The 2020 series cast Kim as the close friend of the lead character, Ahn Eun-young (Jung Yu-mi), who manifests her feelings and desires in the form of jellies.
According to E! News, Kim had lined up another major role shortly before her death as a cast member in Disney+'s upcoming K-drama Sixth Sense Kiss.
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