This is easily one of my favorite Wendy duets.
It is so nice to have Wendy start the song and then stay in her lower registers. (No big surprise since Son Taejin is a bass.) Their singing is relaxed and unhurried, and there is no over-the-top buildup to the song's climax. There's no need for vocal acrobatics or gimmicks when you have voices as good as these.
I was very impressed with the recording/engineering. On headphones I can hear the piano reverb and separation of strings quite clearly. And this is from the youtube MV; I am looking forward to the higher quality Spotify release.