Isaidub is riddled with pop-up ads, malicious redirects, and malware. Downloading an .exe file disguised as "Train To Busan 720p" is a surefire way to infect your device with ransomware or keyloggers.

While the movie is a thrilling blend of horror and depth, it contains and intense gore. It is generally recommended for older teens and adults rather than young children.

It is worth noting that Isaidub is a "hydra" website. Whenever the authorities block one domain (e.g., Isaidub.com), the operators launch a new mirror (Isaidub.xyz, Isaidub.guru, etc.). This cat-and-mouse game means that a link you find today for "Train to Busan" will likely be dead or dangerous tomorrow.