|Stage Name||Birth Name||Position||Birthday||Age||Height||Star Sign||C Y Sort descending||BT|
|Minhyuk 민혁||Lee Minhyuk||Visual||24||178 cm or 5'10"||Scorpio||Rooster||A|
|Kihyun 기현||Yoo Kihyun||Vocal||24||176 cm or 5'9½"||Scorpio||Rooster||B|
|Hyungwon 형원||Chae Hyungwon||Sub-vocal||24||181 cm or 5'11½"||Capricorn||Rooster||O|
|Wonho 원호||Shin Hoseok||Sub-vocal||25||176 cm or 5'9½"||Pisces||Rooster||B|
|Jooheon 주헌||Lee Jooheon||Rapper||23||177 cm or 5'9½"||Libra||Rat||O|
|Shownu 셔누||Son Hyunwoo||Leader, Vocal, Dancer||25||180 cm or 5'11"||Gemini||Monkey||O|
|I.M. 아이엠||Im Changkyun||Rapper, Maknae||22||175 cm or 5'9"||Aquarius||Pig||O|
Pre-debut, the members (and other Starship Entertainment trainees) took part in a reality survival show called "No.Mercy." A total of 13 trainees performed for seven coveted spots to debut in Monsta X.
The show was very popular and is part of the reason why Monsta X had such a large following so early. This allowed them to appear on "Weekly Idol" even before they debuted, which is very rare.
The group's name has an interesting meaning behind it:
MON → My
STA → Star
This is particularly clever since the company's name is Starship Entertainment! "X" gives an element of mystery to the group. "Monsta" can also refer to the group "possessing your heart."
Their fandom name is Monbebe and their fandom color has not yet been announced.
Starship Entertainment created their second male idol group, Monsta X, through a competition reality program titled “No.Mercy” in December 2014.
Starting with 12 trainees ranked by number on the first episode, several hopefuls were eliminated, leaving the seven finalists to form the line up of the final group. The trainees received mentoring from industry and company sunbaes, earned attention from fans, and competed each week through solo and collaboration performances. The judges were given final authority on eliminations.
Rapper I.M. was added midway through the series.
The eliminated trainees were No Yoonho, Choi Seokwon, Kwang Ji, Kim Yoosu, Park Minkyun, and Song Gunhee #Gun (pronounced "Sharp Gun").
A single released during "No.Mercy" was "0 (Young)," on February 4, 2015 starring Giriboy, Mad Clown, and Jooyoung along with Jooheon, Kihyun, Wonho, Seokwon, and I.M. "Interstellar" was a single released on February 12, 2015, with Jooheon, Hyungwon, and I.M., featuring Yella Diamond.
On April 28, Jooheon released his first mixtape, JUNG JI, which included a collaboration with JustMusic Entertainment's BlackNut.