[4] On September 17, the mashup video, providing sneak peeks of all the EP's tracks, including "Case 143", premiered at the "Seoul Special (Unveil 11) of Maniac World Tour.

[13] "Case 143" is three minutes and twelve seconds long and was written by Stray Kids' in-house production team 3Racha, Raphael from Producing Lab, and Daviid and Yosia from 3scape.

[18] Writing for Teen Vogue, Crystal Bell praised "Case 143" as "full of surprises" and described it as "a love song for someone who gets easily distracted.

"[19] Rhian Daly of NME described the song that is "built around an ever-changing rush of sounds, some dark and ominous, others teetering and tumbling.

"[21] "Case 143" experienced popularity in Japan after going viral in the video-sharing application TikTok, resulting in the song being voted first place in Best Entertainment 2022's "Best K-Pop" by Japanese website Modelpress's readers.

[26] Directed by 725 of SL8,[27] the music video starts with the heart-shaped monster, utilizing CGI elements, infecting Felix, then all members, so Changbin calls the police officers, who are also Stray Kids.

The falling-in-love Stray Kids put the plug back to stop collapsing, and they break the video as glass to leave it.

[31] The performance video was uploaded on October 15,[32] showing the choreography scene shot at the front of car wash and the street.

[55] In 2023, Stray Kids sang the Japanese version of the song on the YouTube channel The First Take on February 24,[56] and performed at 74th NHK Kōhaku Uta Gassen on December 31.