IZ*ONE - La Vie en Rose
Speaking of the most well known girl group for October, I would say the debut of Iz One. They are brand new, so I will introduce them briefly here.
Iz One is a Korean-Japanese kpop girl group formed through the Mnet reality competition show Produce 48. The group is composed of 9 Korean members: Jang Won-young, Jo Yu-ri, Choi Ye-na, An Yu-jin, Kwon Eun-bi, Kang Hye-won, , Kim Chae-won, Kim Min-ju and Lee Chae-yeon. Nako Yabuki and 3 Japanese members: Sakura Miyawaki, Hitomi Honda
Iz One made their debut on October 29, 2018, with their first extended play Color*, with "La Vie en Rose" serving as its lead single. The group is currently managed by Off the Record Entertainment in South Korea and AKS in Japan.
A debut showcase concert, entitled 'COLOR*IZ Show-Con', was held in conjunction with the album's release at the Olympic Hall in Seoul, South Korea, in which the tickets to the showcase were sold-out within a minute of being on sale. In its first day of release, the EP sold over 34,000 units reported by Hanteo Chart, setting a new record for the highest number of albums sold on the first day of a Korean girl group's debut release. The music video for the lead single "La Vie en Rose" achieved more than 4.5 million views within 24 hours of its release on YouTube, making it the most-watched debut music video by a Korean act in 24 hours. On November 8, Iz One garnered their first music program win for "La Vie en Rose" on M Countdown. This was the fastest music program win for a girl group, just 10 days after their official debut
April - Oh! My mistake
On October 4, DSP Media confirmed that the group would comeback with their sixth mini-album named The Ruby. The album was released on October 16, along with the title track "Oh! My Mistake". The Ruby debuted and peaked at number 10 on the Gaon Album Chart.
Being in black and white, the promotional poster differed from April's previous imagery as it lacked any primary colors, and noted that the band had evolved and matured with each release, "adding a variety of changes to every album".Several other publications also noted the change in style.
Weki Meki - Crush
Weki Meki released their first single album Kiss, Kicks on October 11, 2018 with a teen crush concept. The album features a total of three tracks including lead single "Crush" with rap portions on the album written by member Yoo-jung
Fromis_9 - Love Bomb
I have introduced this group before, so I won't repeat here. The group has released a special single album titled From.9 on October 10 with the title song, "LOVE BOMB," which reached 1 million views on YouTube on October 12. This was the first comeback with all the 9 members after the return of Jang Gyu-ri. On October 15, 2018, Fromis_9 made their acting debut in a web series, Welcome to Heal Inn, on their official VLive page. However, it was filmed during Gyu-ri's absence.