With IU's fourth album scheduled to be released on April 21 after a year and six months, a comeback stage is set to follow on April 23 through�SBS' 'Inkigayo'.

On April 18, according to a�Star News report, IU will be singing her title song "Palette" on the show. �The song was written and composed by IU herself, with the rapping part created by and featuring�Big Bang's G-Dragon, causing many to look forward to the stunning collaboration.

SEE ALSO: G-Dragon's side denies reports of a comeback set for August

However, it seems unlikely that G-Dragon will be taking the stage on April 21 with IU since he is busy preparing for his own solo promotions as well. �Many are now wondering who will take his place instead.

According to an entertainment source, G-Dragon's rapping segment will be improvised. �But by who and how? Will it be a new rapper or will IU herself take over?

Furthermore, a special event is to follow in light of the singer's return on 'Inkigayo.' �This will mark nearly four years since IU will be making an appearance on a music program.�

Stay tuned for more updates!