The Misconceptions of Us is the third studio album released by South Korean boy band Shinee. It consists of two parts, Dream Girl – The Misconceptions of You and the second Why So Serious? – The Misconceptions of Me, that were later collected together as The Misconceptions of Us under SM Entertainment and distributed by KT Music.

From a production stand point, we wanted to express "Misconceptions of You" in the first chapter and "Misconceptions of Me" in the second chapter. The two albums have a lot of stories about "misconceptions".

On February 7, SM Entertainment announced that Shinee would release their third studio album later that month, with "Dream Girl" as the lead single. Shortly after, the group held the event "Melon Premiere Shinee Music Spoiler" where they revealed songs from the album to 100 music reviewers. The album was confirmed to be split into two "chapters", Dream Girl – The Misconceptions of You and Why So Serious? – The Misconceptions of Me, both within the framework of "misconceptions".

Two of the directors for the album also made an appearance to give a basic explanation about the concepts and meanings behind the project. Director Lee Sung-soo from SM Entertainment's production department shared information about the songs and their meanings, while director Min Hee-jin from the visual and art directing department introduced Shinee's visual concept. Furthermore, the choreography for the lead single "Dream Girl" was revealed, which was choreographed by Tony Testa, who previously worked with Shinee on "Sherlock (Clue + Note)". The making of the music video was also shown which showed the members jumping on trampolines and using running machines. Member Onew stated on the making of the two albums, "It's our first full album that we're releasing in a while, so we worked really hard. Minho and Key worked on the rapping, Jonghyun worked on the lyrics, and Taemin worked on the choreography." Taemin described the album as one where each member's individuality shines through their voices, "We know each other best so a lot of our opinions went into this album." Jonghyun added, "Taemin's delivery of the lyrics is good. Minho's falsetto is really nice these days. Key is good at English. We know each other's strengths so we split the parts up according to who can shine on what. We had fun working on the album."

Dream Girl – The Misconceptions of You can be interpreted as the dreams, ideals, and visions of the world through Shinee's eyes. In contrast, Why So Serious? – The Misconceptions of Me was described as evoking the gap between Shinee's reality and dreams and has an overall deeper and darker sound. Jonghyun stated, "Why So Serious – The Misconceptions of Me will show our worldview. It will have a deep and rough sound. It embodies our group's unique personality and musical sensation". Lee Sung-soo compared the split album format to Shinee's previous release, Sherlock, stating that instead of mixing two songs together, as they had done with "Sherlock (Clue + Note)", they had combined two albums with different concepts into one. Lee also said that there are hidden keywords that connect the songs in the two albums and, "We included a fun point where you can search for keywords and put them together to create several interpretations."

The album's opening track, "Spoiler", contains the titles of songs included in both albums, connecting the two parts. As the song's title suggests, it provides a spoiler for what is to come. "Dream Girl" was produced by Hyuk Shin and his team of composers, Joombas Music Factory. They described the song as "an acid electro funk song". It is written by Jun Gandi and composed by Hyuk Shin, Jordan Kyle, Ross Lara, Dave Cook, DK, and Anthony "TC" Crawford. The song has a fuller sound, featuring electric guitars among various other synths and the beat is very diverse and complex with a lot of tempo changes. The song is described as the most "Shinee-like song" in the album and tells about how the five boys meet their dream girl that only appears in their dreams, and disappears in reality. "Hitchhiking" is about a journey through time and space in pursuit of love. "Punch Drunk Love" compares falling in love to losing consciousness after being hit by a punch. "Girls Girls Girls" resembles a song from a musical, while "Aside" tells a story of unrequited love. "Beautiful" features a catchy hook, evoking a "bright" and "cheerful" atmosphere. "Dynamite" is about melting the cold heart of a lover with love that is hot like dynamite. "Runaway" expresses excitement about making a new start.

"Why So Serious?" is a funk rock dance track that was chosen as the title track and lead single from the album. The song was written and produced by Kenzie and composed by Kim Cheong-bae, Andrew Choi and Kenzie. It is a genre that combines the powerful and catchy melody of pop with electronica sounds. It talks wittily about a zombie that has lived in darkness for a very long time who falls in love with a human girl. "Shine (Medusa I)" is a powerful dance track that "combines high quality lyrics that express the love of fans as a 'shine' together with tough drum sounds to add enjoyment to listeners". Teddy Riley, Andrew Choi and Kim Tae-seong composed the song, with lyrics penned by Misfit and Minho. "Sleepless Night" is a ballad song accompanied by bittersweet tunes of piano. The song was produced by a Canadian songwriter, Matthew Tishler, in his debut collaboration with Shinee, and Im Kwang-ok. Shim Changmin of TVXQ penned the lyrics, while Shinee's resident rapper Minho yet again contributed to the rap portion.

"Selene 6.23" is a collaboration with the classical pianist Yiruma. It is a medium tempo pop ballad integrated with elements of modern orchestra. The instrumental of the piece was composed by Yiruma. "Selene 6.23" is the first collaboration between Yiruma and Shinee. The music producers are Ted Kim and 2Face. The lyrics were penned by Jonghyun.