This is a 2013 action/comedy/drama/tragedy film. Its Korean name is "은밀하게 위대하게" - in Hangul RR, "Eunmilhage Widaehage." It's also known as "Covertness."

From: https://mydramalist.com/5947-secretly-greatly
"A group of spies called the 5446 Corps were trained by North Korean elite special forces since their youth, ostensibly towards the lofty goal of unifying Korea. They are ambitiously dispatched to South Korea, where each disguises himself as a fool, an aspiring singer, and a high school student. Passing boring time without receiving any orders from the North, they gradually get used to life as ordinary neighbors in a small town until one day, their mundane lives are turned upside down when a 'secret and great' mission is suddenly assigned to them."

https://www.imdb.com/title/tt2967578
https://en.wikipedia.org/wiki/Secretly,_Greatly

I downloaded the source file "gimchi-secretlygreatly2013.720p" and extracted its English subtitles. Then I...
- "Softened" subtitled profanity (bastard --> jerk, damn --> darn, bitch --> wench etc.); but note there is some English profanity in the movie anyway (3 shit, 5 fuck, 1 bastard, 1 ass, 1 hell); see my "edited" version which edits those out if you want that.
- Used Subtitle Edit (by Nikolaj Lynge Olsson) to find and fix all flagged issues
- Corrected other commonly-found typos
- Watched the film and made fixes/corrections/rewrites to the subtitles for spelling & grammar
- Re-processed the film using Handbrake to add the subtitles as "soft" (not burned in) subtitles

Format: MKV
Format info: Audio Video Interleave
Total file sizes: 1.52 GB
Total duration: 2 hours, 13 minutes, 33 seconds
Overall bitrate: 1628 Kbps

Video format: MPEG-4
Video Codec: H264 - MPEG-4 AVC (part 10) (avc1)
Video bitrate: 1500 Kbps (2-pass)
Video width: 1280 pixels
Video height: 544 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 extract and use/post however you like)