Written by Ellie Suh, Hyun Ji-won, and Danke alongside Mich Hansen, Jacob "Ubizz" Uchorczak, Celine Svanbäck, and Patrizia Helander, it was released as a pre-release single for their third extended play My World by SM Entertainment on May 2, 2023.

Moreover, he added that Soo-man wanted to start "injecting environmentalist motifs of tree-planting and sustainability into songs" which were eventually later scrapped as they "did not fit the world of Aespa" and made the group "upset".

[3] On April 26, it was revealed that Naevis, the AI character in Aespa's SMCU storyline, would featured in "Welcome to My World" as a virtual artist.

[5] "Welcome to My World" was written by Ellie Suh (153/Joombas), Hyun Ji-won, and Danke (Lalala Studio), composed and arranged by Mich Hansen, and Jacob "Ubizz" Uchorczak with Celine Svanbäck, and Patrizia Helander participating in the composition.

[10] The music video portrays the members "taking a road trip to a forest and connect with nature" with "a mysterious aura [following] them [throughout] their journey", later revealed to be Naevis, "a personified AI system from the group's [world]".