|Stage Name||Birth Name||Position||Birthday Sort ascending||Age||Height||Star Sign||C Y||BT|
|Kangmin 강민||No Kangmin||Dancer, Rapper, Maknae||19||180 cm or 5'11"||Virgo||Hare||O|
|Hyunkyung 현경||Kim Hyunjong||Visual||20||184 cm or 6'½"||Virgo||Tiger||O|
|Kyle 카일||Ma Jaekyeong||Vocal||21||178 cm or 5'10"||Capricorn||Rat||B|
|Minsung 민성||Kim Minhwi||Dancer||21||182 cm or 5'11½"||Capricorn||Rat||B|
|Milo 마일로||Kim Minhak||Dancer, Rapper||22||172 cm or 5'7½"||Leo||Rat||A|
|Yunsung 윤성||Hwang Yunsung||Vocal||22||176 cm or 5'9½"||Pisces||Rat||A|
|Seunghwan 승환||Lee Seunghwan||Leader, Rapper||23||176 cm or 5'9½"||Sagittarius||Dog||A|
Romeo 로미오 is a boy band formed by Pony Canyon Korea and CT Entertainment in 2015. The group is composed of seven members: Seunghwan, Yunsung, Milo, Minsung, Kyle, Hyunkyung, and Kangmin. They debuted with the release of their first mini-album The Romeo on May 7, 2015.
At the end of April 2015, it was announced that Japanese company Pony Canyon had partnered with South Korean agency CT Entertainment to debut a boy group named Romeo, planning their debut for May. A representative from CT Entertainment told the media, "There have been cases where Japanese music labels will sign on popular Korean acts, but it's unlikely for a Japanese music label to want to start a Korean group. This project is happening thanks to the great trust between Pony Canyon and CT Entertainment."
Following this announcement, their agency released a batch of teasers featuring the members, starting with Hyunkyung and ending with Yunsung and Minsung, and finally a full group teaser on April 27. Their agency released another teaser on April 30, this time featuring member Yunsung covering Michael Jackson's "Man in the Mirror" before releasing the group's first teaser for their debut song "Lovesick" on May 2. The full music video for "Lovesick" was released on May 7, alongside their debut EP The Romeo. The group made its debut onstage on "M Countdown" the same day.
On October 28, it was announced that Romeo was going to make a comeback on November 5 with their second mini-album Zero In. On October 30, the group released their first teaser for "Target" followed on November 1 by a second teaser. On November 3, they released a medley of the songs from Zero In and on November 4 they released the full music video for "Target."
On May 17, CT Entertainment revealed that Romeo was going to release a summer digital single named "Nightmare" on May 23. The group released teasers featuring the seven members before releasing a video teaser on May 20. The full music video for "Nightmare" was released on May 23 alongside the digital single.
On June 17, the group debuted the broadcasting of their first reality TV show named "Romeo Project in Taiwan" on MBC Music.
On June 19, Romeo was announced to release a new EP, Miro, on June 23, issuing teasers. The group then released two teasers with an "Alice in Wonderland" concept featuring SHINee's Minho, for the title track. Minho took part in filming the group's comeback music video thanks to CT Entertainment's CEO who used to be SHINee's manager. The full music video for "Miro" was released on June 23 alongside with the EP, which was released in three different unit versions. A full group version of their new EP was released on July 5. The group revealed that their choreography for "Miro" was inspired by the film The Maze Runner.
On August 17, CT Entertainment announced that Romeo was going to release a special edition of "Miro" as "First Love" on August 22, featuring the lead track "Treasure." They also released some teasers with the members.