This is the 2017 Korean TV romance/comedy/life/fantasy drama series. It's also known as "Go Back Spouses," "Confession Couple," "Confession Spouses," "Go Back to 1999," and "Couple on the Backtrack."

From MyDramaList: https://mydramalist.com/24863-go-back-couple
"38-years-old married couple Choi Ban-do and Ma Jin-joo were in love when they got married, but now hate each other and regret marrying at such a young age. Ban-do has been burdened with being the breadwinner, and Jin-joo is a housewife with low self-esteem. The couple travels through time and finds themselves as 20-year-old university students when they met for the first time."

Wikipedia: https://en.wikipedia.org/wiki/Go_Back_(TV_series)
IMDB: https://www.imdb.com/title/tt7418578
AsianWiki: https://asianwiki.com/Go_Back_Couple

This is the complete set of 12 episodes, each one being about an hour long (between 54 and 71 minutes). 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 "Couple.on.the.Backtrack.S01E01.1080p.NF.WEB-DL.DDP2.0.x264-HBO.mkv" and extracted the subtitles from them. Then I...
- Used a linear video editor to remove short parts of episode 10 (2 minutes of porn-watching at the 30-minute mark; 8 seconds of references to antiquated ideas about virginity at the 40:19 mark)
- 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

Format: MKV
Format info: Audio Video Interleave
Total file sizes: 14.0 GB (15,056 MB)
Total duration: 12 hours, 14 minutes, 38 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
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: 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