Sub-unit

In 2009, Jong-hoon, Min-hwan, and Jae-jin formed a sub-group called F.T. Triple. Some of the reasons behind this lineup were to showcase more of the members' skills and to prevent main singer, Lee Hong-gi, from overstraining his voice again. Another reason was to continue promoting F.T. Island while Hong-gi was filming You're Beautiful while Seung-hyun was having a break.[2]

At first, the trio was unofficially announced at the Dream Concert in Japan as "A3". They almost named themselves A3 because they all are of blood type 'A'. They also wanted to keep the F.T. name hence adding Triple at the end of it to represent a trio.

In F.T. triple, Jae-jin originally in charge of bass for F.T. Island becomes a guitarist and the main vocalist; Jong-hoon plays the piano and Min-hwan continues to play the drums. Their first single was titled "Love Letter" and was released with F.T. Island's 2CD Repackaged Album Double Date and a second CD named Two Date that features all of F.T. Triple's songs.[136]