"Always Love You" was written by composers Jang Young-wan (장영완) and Tae Bong-i (태봉이) with additional writing by lyricist Iyuna (이유나).

[7][8] On October 19, Kim flew to Japan for a fan meeting and live showcase in the country promoting his single in Japanese language.

[11] The teaser for the video, released on August 8, first showed Kim Hyung-jun riding an airplane to see the top view of Hanseo University's airfield.

[13] The song is an acoustic medium R&B produced by Kim himself, while the music video has an innocent love story theme, filmed on Hanseo University' airfield, and even capturing sights in the sky.

After the song title is displayed, Kim and his friends start to run from the beach side towards an ice cream vendor, who puts his hand out to stop them.

The video ends with the back view of Kim and Kota sitting on the sand and watching the sunset over sea with their Korean names seen below the "우리둘이" song title.