Guess Who (stylized in all caps or as GUE?? WHO) is the fourth extended play by South Korean girl group Itzy. It was released by JYP Entertainment on April 30, 2021. The EP was released for pre-order on March 22. The EP contains six tracks, including the lead single "In The Morning". The physical album comes in three versions: Day, Night, and Day&Night. The EP is primarily a rap-styled K-pop record that combines EDM, hip hop, dance, dance-pop, trap, Latin trap, and bossa nova elements.

Genre: KPOP

Format: CD

Track-list:

1. 마.피.아.IN THE MORNING (TITLE)
2. Sorry Not Sorry
3. KIDDING ME
4. Wild Wild West
5. SHOOT!
6. TENNIS

Contents:

1x Album random 2p photo card ( Photocard 20 types )
1x Album random 1 Photobook (Photobook 3 types)
1x Album random 1 Mini Poster (Mini Poster 5 types)
1x Album random 1 Sticker Pack ( Sticker Pack 2 types)
1x  Album random 1 Newspaper (Newspaper 2 types)