Apart from their latest comeback, TWICE and ONCEs had one more thing to celebrate and that's Nayeon's birthday!

Jeongyeon shared a funny photo of her and Nayeon together, which obviously occurred behind-the-scenes, and wrote, "Happy birthday to our oldest member."

Chaeyoung, one of the youngest, also published snaps of Nayeon and captioned it with,
"Happy birthday to our energy and oldest member, Nayeon. I love you. Chaeng-ie."

Momo, on the other hand, shared a random few photos of Nayeon from her gallery, as well as their selca together, along with the caption, "Happy birthday Bok unnie."

Also, one of the TWICE members unveiled photos of Nayeon sleeping and making funny facial expressions, and wrote, "I only have one normal photo [of Nayeon] in my gallery.. Happy birthday to the funniest person in our group. You know that I chose these carefully, right? Let's meet tomorrow with smiles on our faces. Let's go, TWICE's comeback!"

As her way to express her gratitude, Nayeon shared her selfies and included her message to the fans.

"Thank you. Thanks to ONCE who are always more excited and happier than me for my birthdays, I was able to spend a much happier [September] 22nd. I won't be able to forget the effort and care that ONCE put into their preparations. It was a special 25th birthday! So special," she said.

Meanwhile, TWICE just unveiled their eighth mini-album "Feel Special" as well as the music video of their title song. During the showcase held on Monday, September 23, Jihyo talked about the track and how it came up.

"Producer Park Jin Young said that he wrote the lyrics after listening to our stories. When we first heard the song, we were grateful that he expressed what we felt so well. We talked among ourselves about our struggles and said that we wanted to release a meaningful album this time around. The nine of us won't be able to promote together, but this is a story that nine of us are telling together," she revealed.

Mina, however, will not be joining the others in promoting this comeback due to health reasons. Jihyo, on the other hand, was not able to participate in the dance because of problems with her neck.

"I'm sorry for not being able to dance when it's our very first performance of this song. My condition is not serious right now, but the doctor said that my neck has been under a lot of strain and recommended that I rest for now. I came back from the hospital after taking painkillers and I will do my best to recover quickly," the group's leader explained.