From Wikipedia: Rumors circulated that member Oh Won Bin would be leaving the group, and on January 28, 2009, the rumors were confirmed that Oh would leave the group and would be replaced. A day later, it was announced that F&C trainee Song Seung Hyun would be joining F.T. Island as a guitarist and backup vocalist. With the new lineup change, F.T. Island released the music video for mini-album lead song "Bad Woman." They also promoted it on SBS Inkigayo, and two days later, released the mini-album Jump Up.
After promotions in Korea ended, F.T. Island returned to Japan, where they released second Japanese single. It was the first time members contributed to their music as well, writing lyrics and helping with production. While member Lee Jae Jin co-wrote the second song "Moonlight Angel," leader Choi Jong Hoon helped co-produced it. I Believe Myself became the first single with member Song Seung Hyun's vocal. To promote their music, the group held several performances in Japan during the summer of 2009. Jump starting their Asia Tour, F.T. Island visited Singapore, Japan, Thailand, Taiwan and several others countries for several weeks. The tour kicked off in Singapore. For one hour, the five members performed their hit songs from their latest album, including 'Bad Woman,' to a full house of 900 fans from different countries. A couple of days later, the band left Singapore on an overnight flight after the performance ended.