Production trio 2lson draws on '90s R&B, acoustic guitar pop, and ballads to create café pop tunes with a beating heart. The group's compositions attract some of the best rappers and R&B singers in South Korea (including Dok2 and Moon Myung Jin), but the star power is ultimately secondary to the emotional impact of the song. For every lush ballad like Ailee's “I'm In Love,” there's a stripped-down track—like the voice-and-piano piece “Love Goodbye”—that pulls just as hard on the heartstrings.