[11] Lovelyz held their comeback showcase at Blue Square iMarket Hall on April 23, 2018, the same day as the album's release,[12] and was hosted by comedian Park Sung-kwang.

[14] Lovelyz began their music show promotions, with their first comeback stage on Mnet's M Countdown where they performed "That Day" and "Watercolor" on April 26.

[16] "That Day (그날의 너)" was written and composed by Sweetune, who previously produced "Emotion" and "The" in the second studio album R U Ready?.

[17] The composers of the lead single "Twinkle" of the previous EP Fall in Lovelyz, 1Take and TAK, returned with a new b-side track titled "Shining★Star".

Heal topped the iTunes K-pop Music Albums in the United States and Hong Kong in the first week of its release.