[3][4][5] On March 8, SM Entertainment confirmed that Exo's sub-unit Exo-CBX, would be making their Korean comeback in April.

[17] On April 10, the mini album was officially released along with the title track's "Blooming Day" music video.

[18] EXO-CBX began a special relay live schedule starting on April 9, which lasted for seven days.

[25] EXO-CBX began performing the lead single "Blooming Day" on South Korean music shows from April 12 on Mnet's M!Countdown.

The song was described as "a light and chic dance-pop track where the members' sweet vocal colors will be showcased.