IU is joining Sweet Sorrow concert as a guest.

Sweet Sorrow is having two Christmas special concerts at Korea University Hwajung Hall on Dec 24 and 25.

Especially, this guest appearance deal was set upon IU's request to Sweet Sorrow. IU, who recently released a new album, asked Sweet Sorrow if it's okay for her to join them despite her extreme busy schedule.

Sweet Sorrow is planning to perform special arranged carols and some of new songs that will be on the 3rd album in January.

Photo: Leon Entertainment