This is a beautiful song by AKMU or Akdong Musician. They are a brother/sister duo under the YG label. The brother, Lee Chan-hyuk, composes the songs and writes the lyrics. The sister, Lee Su-huyn, has a wonderfully unique voice. The English title for this song is also very long: How can I love the heartbreak, you’re the one I love.
Here are some of their other songs on my Spotify K-Pop play list:
Life with chronic diseases 