Just know I finished hearing BTS -  Blood sweat and tears...
recently found this song again, it's called johnny by primary (ft. dynamic duo) ^^

https://www.youtube.com/v/RktRJRXEtBg?autoplay=1
Seo In Guk - 너 라는 계절 (Seasons of the Heart)

This song grew on me very suddenly!

Seo in guk's Seasons Of the Heart ♡
IU (아이우) – 바람꽃 (WINDFLOWER)
Don't Worry, My Dear - Lee Juck (Reply 1988 OST)