According to StarNews, IU participated in recording the episode from 9 AM to 11 PM at the KBS New Wing Hall. As this episode is an IU special, the stage was set up specifically for IU and no other artist. Starting from 9 AM, IU performed her songs more than 60 times in the 14-hour recording session. IU is shared to have prepared around 13 songs. She put her heart and soul into the recordings, as she went through tech rehearsals, dry rehearsals, camera rehearsals, and live recordings for each song. At 11 PM, IU finished recording her ŌĆ£Good DayŌĆØ performance. It is shared that some staff members were lost for words and teared up during the recording session. IU performed songs like ŌĆ£BBIBBI,ŌĆØ ŌĆ£Blueing,ŌĆØ and ŌĆ£Eight.ŌĆØ IUŌĆÖs special episode on Yoo Hee YeolŌĆÖs Sketchbook will be broadcast on the same day as her 12th anniversary, September 18th. Source (1)

IU Shared To Have Spent 14 Hours Rehearsing and Recording For Her Mini Concert on    Yoo Hee Yeol   s Sketchbook    - 30