According to Wikipedia page https://en.wikipedia.org/wiki/Playback_(South_Korean_band) this Kpop girl group release this song on their title album Playback in 2015. Well I just discovered the song on Koreaboo.com. Koreaboo has a different video I found this one on Youtube on the official channel CJENMMUSIC.
Just found “Koreaboo” website on Korean Entertainment on Twitter https://twitter.com/Koreaboo saw they posted a story from their website about a composer’s alleged plagiarism on a OST song http://www.koreaboo.com/news/lead-composer-gobins-soundtrack-defends-drama-plagiarism-accusations/
I haven’t yet watched the new Kdrama it is playing on Dramafever. Goblin has Goo Yoo, Kim Go Eun, Lee Dong Wook, Yoo In Na and Yook Sung Jae. There are only 16 episodes to this highly anticipated kdrama. This is listed on Dramafever as a romantic comedy, melodrama, supernatural and fantasy series.
Love this R&B Korean song!!!!💽