The boys' fanclub was officially dubbed MONBEBE on September 26th, 2015. The 'mon' is from MONSTA X and also means 'mine' in French, and 'bebe' is taken also from the French word for 'baby'. The fanclub name basically means that their fans are their babies.

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To celebrate 2 years since the inauguration of the fanclub, the boys each wrote a handwritten message for their fans.

Leader Shownu wrote, "MONBEBE, it's already your second birthday. Isn't it weird? Time passes by so fast. Congratulations on your 2nd birthday, and thank you so much for staying by our side. It's only been 2 years, but I think we get closer as time passes. I don't know how much closer we'll get in the future... Hehe. Are you looking forward to it? Stay healthy and I love you!!"

Wonho wrote, "Happy birthday!! I pray that even if I'm born again, I'll be able to meet MONBEBE at the same place. Thank you for coming to me and smiling for me, and I love you. Let's walk together always!"

Minhyuk wrote, "MONBEBE, hi, it's Minhyuk. Thank you so much for being the closest to us no matter rain or snow. We'll protect you by your side from now on and into the future, no matter if it rains, if it snows, if the wind blows, if you're sad, or if you're happy."

Kihyun wrote, "Happy birthday to you~ Happy birthday to you~ Happy birthday to MONBEBE~ Happy birthday to you!! It's your 2nd birthday. You guys are still babies~ I'm so happy that our MONBEBEs are celebrating your 2nd birthday. I always say this but thank you, and thank you again. I'll become a singer you can be even more proud to call yours! MONBEBE, congratulations, and when you become 20 years old, let's party together!!"

Hyungwon wrote, "MONBEBE has finally reached its' 2nd birthday! Time has flown by. It's all thanks to MONBEBE that MONSTA X has come here, and that MONBEBE has reached its' 2nd birthday. Please take care of us in the future as well. We'll put on great stages, and I'm always thankful. Let's be together on your 3rd birthday as well. Happy birthday!!"

Jooheon wrote, "MONBEBE, I love you the most and you are as beautiful as angels. I'm so thankful that you give us happiness, and congratulations on your birthday. You know we cherish you, right? You know we love you, right? You know we depend on you, right? You know that we.. think about you every day, right? Happy birthday once again and thank you everyone."

I.M wrote, "MONBEBE, happy birthday. Thank you for coming to me and to us. Let's grow a lot with my love. I love you lots. No, I love you more."