?F.T. Island has released the PV for "Theory of Happiness"!

"Theory of Happiness" is the their 11th Japanese single, and it'll be released on July 24. The single will contain 3 songs, including "Theory of Happiness", and two others titled "Eyes on Me" and "Rainy Day".

SEE ALSO: F.T. Island to release 11th Japanese single "Theory of Happiness"

The single will be released in 4 versions, 3 of which will include a special DVD and one that just contains the CD single.

But as always, before their actual release, the boys have released the PV, so check it out above!