This is the 2021 Korean action/thriller/mystery/crime drama series. Its native title is "검은 태양" and it's also known as "The Black Sun" and "Black Sun."

From MyDramaList: https://mydramalist.com/680385-black-sun
"In this spy series, top NIS agent Ji-hyuk seeks to uncover a traitor, unveiling a larger threat. His memory loss leads him to a minor task team, where he meets Je-yi and a compassionate Seo Su-yeon. Together, they navigate intrigue and danger within the organization."

IMDB: https://www.imdb.com/title/tt14482296
AsianWiki: https://asianwiki.com/The_Veil

This is the complete set of 12 episodes ranging from 67 to 75 minutes long 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 videos named like "The.Veil.E01.1080p.H264.AAC.WEB-DL-LoveBug.mkv" and extracted the English subtitles from them. 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 and adjusted words/minute to at least 280
- "Softened" all subtitled profanity (bastard --> jerk, damn --> darn, bitch --> witch etc.)
- Corrected commonly-found typos, converted Korean Won amounts into American Dollars, converted British terms to American ones, and converted Korean names to AP style (family name followed by hyphenated given name)
- Used Handbrake to create new MKV files using my subtitles

Format: MKV
Format info: Audio Video Interleave
Total file sizes: 16.0 GB (17,275 MB)
Total duration: 14 hours, 2 minutes, 32 seconds
Overall bitrate: 2728 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: 1080 pixels (frame height is 960 pixels; the rest is black space)
Video frame rate: 29.970 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: 128 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