"Train to Busan" was a significant hit both critically and commercially. Released in 2016, the South Korean zombie thriller directed by Yeon Sang-ho received widespread acclaim for its intense storytelling, character development, and social commentary. It grossed over $98 million worldwide against a budget of around $8 million, making it one of the highest-grossing Korean films of all time. The film's success also led to a sequel, "Peninsula," and it has gained a strong cult following internationally, solidifying its status as a modern classic in the horror genre.

Yes, "Train to Busan 2: Peninsula" is connected to "Train to Busan," but it is not a direct sequel featuring the same characters. Instead, it takes place in the same universe, four years after the events of the first film, focusing on a different set of characters facing the aftermath of the zombie apocalypse on the Korean Peninsula. While it expands on the lore and consequences of the outbreak, it tells a separate story with new challenges and experiences.

In "Train to Busan," the virus that causes the zombie outbreak is initially released from a biotech facility after a worker accidentally crashes a truck, leading to a leak. The infection spreads rapidly as passengers on the train to Busan come into contact with an infected individual. The outbreak serves as a central plot point, driving the characters' struggle for survival throughout the film.

"Train to Busan" is popular for its thrilling blend of horror, action, and emotional depth. The film features a gripping storyline where passengers on a train must survive a zombie outbreak while confronting their fears and moral dilemmas. Its strong character development and relationships resonate with audiences, making the stakes personal. The claustrophobic setting of the train intensifies the suspense, and the film's commentary on human nature and sacrifice adds layers to its appeal. Additionally, its high production values and impressive visuals contribute to its success.