FT Island announced the comeback with the 4th mini album 'Grown-Up' on Jan 31. The album ranked on the top as soon as the release gaining big popularity. 

FT Island Hong Ki explained before appearing on KBS 'Music Bank' in the waiting room regarding the title song 'Fiercely', "We planned to play the song as the title one when we were performing 'Like Birds', Contrast to the prior style of FT Island, it's very powerful, different which is why we have so much love for the song. We want to win the first place after a long time. We are fully confident".

Photo: FCN Music