Their first EP was not a commercial success, and when their song "Dancing Queen" was released in October, the group had few opportunities to promote on music shows.

The group's unique stage outfits and choreography gained public attention, and made the title song a viral hit.

The group has held solo concerts in South Korea, Japan and Taiwan, and has also performed in other countries including Australia and China.

[2] On 30 May, it was revealed that Way, Choa, Geummi and Ellin would continue to promote as Crayon Pop under Chrome Entertainment, but Soyul had chosen to leave the group.

[3] The group was initially named Hurricane Pop, and consisted of members Serang (Yang Se-hyeon), Geummi (Baek Bo-ram), Ellin (Kim Min-young), Choa (Heo Min-jin), and Soyul (Park Hye-kyeong).

[4][5] Chrome Entertainment's CEO, Hwang Hyun-chang, did not consider candidates who were taller than 165 cm or had a sexy image, because he wanted a group of ordinary girls.

[27] Through these activities, Crayon Pop developed a loyal fanbase, especially of "uncle fans" called "Pop-jeossi" (from the Korean word ajeossi).

As a result of considerable demand from fans unable to purchase tickets, Chrome Entertainment announced that another Japanese concert would be held at a later date,[14][31] and a second mini-concert was staged in Osaka on 22 February.

Filmed with a budget of only 380,000 won (US$347),[12] the music video went viral and Crayon Pop drew interest due to their unique stage outfits and choreography.

[20] That same day, it was announced that Crayon Pop had signed a contract with Sony Music Entertainment, who were inspired by the groups' creativity and uniqueness and saw their global market potential.

CEO Hwang responded by saying he was registered on many popular online communities, including Ilbe, in order to gather information about singers and girl groups.

[51] In November, Sony Music sponsored a week-long trip to Sydney, Australia, where the group held two performances and fan signing events.

[52] They also appeared on several Australian TV shows, including SBS PopAsia, and did a guerrilla performance in front of the Sydney Opera House.

[53] On 22 November, Crayon Pop collaborated with Norwegian duo, Ylvis, to perform a special stage at the Mnet Asian Music Awards in Hong Kong.

The music video had more than one million views on YouTube in one day,[68] and featured cameos from DJ DOC's Kim Chang-ryeol, Bumkey, and comedian Yoon Sung-ho.

Choa made her acting debut in High School: Love On in July,[76] and on 26 September, Crayon Pop released the single "C'mon C'mon" for the drama's soundtrack.

[77] Earlier in the year, they had recorded a Korean-language version of "Everything Is Awesome" for the Korean dub of The Lego Movie, which was released theatrically in South Korea on 6 February.

They were the opening act for Hunan TV's Lantern Festival Program on 14 February, marking their debut on a television show in Mainland China.

From 26 June to 22 July, the group was the opening act for Lady Gaga's ArtRave: The Artpop Ball concert tour in Milwaukee, Atlantic City, Boston, Montreal, Buffalo, Toronto, Chicago, San Antonio, Houston, Dallas, Las Vegas and Los Angeles.

[87] Lady Gaga had asked Crayon Pop to open all 29 concerts in North America, but they only agreed to one month because they needed to work on their first full-length album.

[98] During their three-day stay in Bangkok, Crayon Pop also participated in a news conference about the campaign, attended by more than 50 media outlets, and appeared on Rueng Lao Chao Nee, the most popular morning television program in Thailand.

[111] Crayon Pop was featured on Mexican boy band CD9's single "Get Dumb", released on 24 August in two versions – English and "K-Mex" (Spanish and Korean).

[114] Before their official comeback, their company Chrome Entertainment announced their upcoming album would be a 'renewal', and that the members would play a large role in the process.

The group released their first Korean studio album Evolution Pop Vol.1 with lead single "Doo Doom Chit" on 26 September.

After a few weeks of promotion on various music shows, it was announced member Soyul would be on a short hiatus after developing anxiety disorder during the preparations for the album.

[116] Still as a group of four, Crayon Pop held an event named Winter Party on 19 February, which was co-hosted with Internet crowdfunding platform makestar.co and funded by the fans.

[120] On 8 May, it was confirmed that although both parties had repeatedly denied the rumours of a pregnancy and shotgun marriage,[121][122][123] Soyul was pregnant and would be giving birth to a girl the same month.

[124][125] On 31 May, an announcement was made that Geummi, Ellin, Choa and Way signed a non-exclusive contract under Chrome Entertainment to promote as Crayon Pop, however their solo careers would be managed by other labels.

[3] In a separate statement, Chrome Entertainment wrote "Soyul in her current situation is dedicated to parenting, so Crayon Pop will act as a 4-member group, for the time being".

[138] In April 2015, Choa and Way were featured on Kim Yoo-min's "Road" (길), the lead single from his debut mini album (released under the stage name, Bear Planet).