2 – Breath is the second extended play by the South Korean project group SM the Ballad.

The other less promoted song is "Blind", with both the Korean and Japanese versions sung by Yesung, and recorded prior to his military enlistment.

A Mandarin version of "Set Me Free" sung by Zhang Liyin was released exclusively online on Baidu Music on the 13th.

Taeyeon and Jonghyun performed "Breath" for the first time on M Countdown on 13 February.

Chen and Zhang Liyin also performed the Chinese version of "Breath" on the live broadcast of Chinese Hunan TV's The Lantern Festival the day after.