Look at the file size. A good English SRT file is between 80kb and 150kb per episode. If the file is 30kb, it is machine-translated garbage missing half the dialogue.
: Often considered the gold standard. It has a massive community-driven database. You can search by the specific drama title and often find subtitles tailored to specific release groups (e.g., NEXT, LIMO), ensuring the timing is perfect. download kdrama english subtitles