It mostly consists of Japanese versions of previously released Korean songs from his mini albums Break Down and Lucky.

The only original Japanese song is "Hohoemi No Chikara" (Japanese: ほほえみのちから), which is featured on one of the three available editions.

on TV programs and released music videos for the aforementioned song and "Lucky Guy" (Japanese Ver.).

Some of the songs will be featured on Kim Hyun-joong's upcoming Japanese album Unlimited.

[4][5] KISS KISS / Lucky Guy reached #61 on Oricon's Yearly Single Chart, having sold 121,547 copies.