Choose audio and text separately
For a Korean drama, you might want Korean audio with translated subtitles, a dub or captions in the spoken language. Inspect both menus on the viewing service. One language selection does not necessarily change the other.
The catalog language is not a track list
A Korean-language classification describes the work. It does not claim that every service offers Korean audio plus every subtitle language. Check the particular edition and episode when a language matters to your watch.
Make the text readable where you sit
Use the player’s size, background or contrast controls when available. A setting that looks large near a desktop monitor may be too small across a room. Try a bright and a dark scene rather than judging only the menu preview.
Captions can do more than translate
A caption track may identify speakers and meaningful sounds. Read the label carefully if those cues are important. Audio description supplies spoken descriptions of visual information and is a different option.
Timing and wording are different problems
A dub and a subtitle translation may phrase the same line differently. That alone is not a timing fault. If captions appear clearly before or after speech, try another supplied track or reload the episode. Use timing adjustments only if the player provides them.
Keep your place while investigating
Record the episode and approximate position before leaving a long playback session. You can return to that moment after changing an edition without looking up a recap that may reveal later events.