CNBLUE are preparing for their upcoming limited edition of their latest album 'Re:BLUE'.

FNC Entertainment released behind-the-scenes photos that show the four members of CNBLUE creating the design of the album jacket. The band also wrote and composed the songs in the album, leaving fans impressed by their participation in the overall album production process.

The special limited album also rose to the top of Japanese music site 'Tower Records' album pre-orders chart. CNBLUE's title track "I'm Sorry" also ranked #1 on Billboard's World Album chart, showcasing their popularity worldwide.

The special limited version of CNBLUE's 4th mini album 'Re:BLUE' will be released on the 31st.