 "Breath" is the first and most heavily promoted song of the two, the Korean version is sung by Taeyeon and Jonghyun; the Chinese version by Chen and Zhang Liyin, while the Japanese version is sung by Max Changmin and Krystal.The other less promoted song is "Blind", with both the Korean and Japanese versions sung by Yesung, and recorded prior to his military enlistment.The Chinese version of "Blind" is sung by Zhou Mi.