aaa I searched deep for these songs, I think I ended up listening 82 song that day xD a few of them I found it in some korean indie rock playlists :0
I also saw that there are a lot of korean channels who upload music and it's very interesting to see the kind of music they share (also their visual are very minimalist and so cool aaa it's very different from occidental playlists)
"Poclanos" and "Mirrorball Music", for what I saw they're official distributor for small/indie artists. These are their channels aaa (follow pls they upload good music)

Poclanos:    • [Playlist] 나의 새벽을 부탁해! 몽환적이고 신비로운 신스 ...   (2 songs are from this playlist xD)
Mirrorball Music:    • PLAYLIST | 다채로운 사운드의 향연, 신선한 인디밴드 뮤직  
also this playlist it's very cool:
   • Korean Rock & Indie  
my fav playlist so far:    • Video  
watch "ourneeds." korean channel! also upload cool music
   • Video  

you can find the songs here!
   • k-indie/synth/other genre songs  
Spotify link: open.spotify.com/playlist/3gcFaguufRJHWPAxdUY5ts?s…

also, I found the songs in "Bugs!" if you know somethings about k-pop and its streaming music websites, maybe you know it. It's like Melon music :0
if you are very interested to find new indie rock artists you can go there and search in Korean typing in the search bar "인디 락" which means "indie rock". Bugs' user playlists is a very useful option, I did listen to a lot of them to discover new artists aaaa, well this in my advice. Sometimes it's much better to find music in their native language!
(tip: if you see the tag "domestic" in a playlist, it means it's from Korea)
well, I guess sounds kinda obvious in english (? but because I speak spanish this was my first time reading that word and in that context.

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