Egotistic

In January 2018, Mamamoo released the digital single "Paint Me", a precursor to their upcoming album project titled 'Four Seasons, Four Colors', in which the group would release four EPs, each focusing on one member and a corresponding season. In March 2018, the group released the first installments in the series, Yellow Flower and the single "Starry Night". On July 16, 2018, Red Moon was released as the second installment of the series, with "Egotistic" serving as the main single for the era.

On August 7, 2019, the re-recorded Japanese-language version of the song was released as part of the group's debut Japanese album, 4colors, by JVCKenwood Victor Entertainment. On September 15, 2021, a remix of the song subtitled the "Blistering Sun Version" was released as part of their debut compilation album I Say Mamamoo: The Best.

Musically, "Egotistic" is a K-pop song with strong Latin influences. At a runtime of three minutes and 16 seconds, the song is composed in the key of E-flat minor with a tempo of 98 beats per minute.

"Egotistic" debuted and peaked at number four on the Gaon Digital Chart, with over 47.1 million index points earned in its first week, debuting at number one on the component Gaon Download Chart. It remained within the Gaon Digital Chart's top-five in its second week, with 44.4 million index points, and spent seven weeks in the chart's top-ten before slipping to number 11 in early September. On the monthly rendition of the chart, "Egotistic" peaked at number six in August. Overall, "Egotistic" was the 48th highest-performing song of 2018 on the Circle Digital Chart, being the 41st most-downloaded and 49th most-streamed.

Elsewhere, "Egotistic" peaked at number 27 in Singapore and at number four on the Billboard World Digital Song Sales chart. It charted for five weeks on the latter, making it their second longest-charting song alongside "Gogobebe" (2019).

Digital download/streaming

1. "Egotistic" (너나 해), 3:16

Digital download/streaming, Japanese Version

1. "Egotistic (Japanese Version)", 3:18

Digital download/streaming, remix

1. "Egotistic (Blistering Sun Version)", 3:31