This is the 2022-2023 Korean action/thriller/horror/fantasy TV drama series, Korean name "아일랜드" which is just Hangul for the English title. It originally aired close together in two sets/"seasons" of 6 episodes each.

From MyDramaList: https://mydramalist.com/51327-island & https://mydramalist.com/60739-ireland-season-2
"Won Mi-ho is the only daughter of her father who runs Daehan Group. Her arrogant and selfish attitude causes her to make a big mistake that eventually angers her father into banishing her to Jeju island. There, she is assigned to work as a high school ethics teacher. Unbeknownst to her, the island is where evil roams free. She meets other individuals on the island and together, the characters join forces to live."

Wikipedia: https://en.wikipedia.org/wiki/Island_(South_Korean_TV_series)
IMDB: https://www.imdb.com/title/tt14166656
AsianWiki: https://asianwiki.com/Island_(Korean_Drama) & https://asianwiki.com/Island_Part_2

This is the complete set of 12 episodes which run between 41 and 57 minutes each. They all have edited "soft" English captions; that is, English subtitles are part of the MKV file and the subtitles can be enabled or disabled as you wish.

I downloaded the source files named like "Island.S01E01.1080p.AMZN.WEB-DL.DDP2.0.H.264-ShiNobi [DRAMADAY.net].mkv" and obtained YoungJedi's subtitles from subscene.com. Then I...
- Used Subtitle Edit (by Nikolaj Lynge Olsson) to find and fix all flagged issues
- Added 0.7 second to each subtitle (where possible) to allow more time to read them
- "Softened" all subtitled profanity (bastard --> jerk, damn --> darn, bitch --> wench etc.)
- Corrected commonly-found typos, also converting many word pairs into their common English contractions
- Watched the series and made additional corrections, also italicizing music lyrics, characters' thoughts, flashbacks, and some off-screen dialogue
- Used Handbrake to create new MKV files using my subtitles, trimming off the intro and the lengthy end credits

Format: MKV
Format info: Audio Video Interleave
Total file sizes: 11.5 GB (12,454 MB)
Total duration: 9 hours, 48 minutes, 35 seconds
Overall bitrate: 2824 Kbps

Video format: MKV
Video Codec: H264 - MPEG-4 AVC (part 10) (avc1)
Video bitrate: 2600 Kbps (2-pass)
Video width: 1920 pixels
Video height: 960 pixels
Video frame rate: 23.976 fps
Video decoded format: Planar 4:2:0 YUV
Video scan type: Progressive

Audio format: MPEG AAC Audio (mp4a)
Audio language: Korean
Audio bitrate mode: Constant
Audio bitrate: 224 Kbps
Audio channel(s): 2
Audio sampling rate: 48 KHz 

Subtitles:  English as soft captions - feel free to rip & use or distribute as you wish