Answer
Song Hye-kyo, Kim Tae-hee, and Jun Ji-hyun are collectively known as the "Troika" or the "Big 3" of South Korean cinema. They gained immense popularity and critical acclaim in the late 1990s and early 2000s, dominating the Hallyu wave and becoming household names throughout Asia. Their exceptional beauty, talent, and star power made them the most sought-after actresses in the industry.