Rookie idol group Big Star's leader FeelDog revealed a message written to their fans.

Today, FeelDog revealed a handwritten letter on their official fan cafe with the title, 'To Big Star's Only One.'

His handwritten letter read, "4 years of training, then debut, our first stage. It has already been 100 days since our debut. I still can't believe it. We still lack in many areas but we are always working hard and trying our best. It is because of our fan club that we are confident and strong. This is embarrassing and cheesy to say, but I hope that we will be together, 100, 1000, even 10,000 days from now. We are so thankful for all of you."

Other Big Star members also wrote messages on the fan cafe expressing their thanks as well.

Internet users commented, "The leader is very cool" and "Congrats on your 100 days!"