- Nama: Yoo Ah In
- Nama Asli: Uhm Hong Shik (Eom Hong Sik)
- Pekerjaan: Actor
- Tanggal Lahir: 1986-Oct-06
- Tempat Lahir: Daegu, South KoreaTinggi: 181cm
- Berat: 62kg
- Zodiak: Libra
- Golongan Darah: A
- Talent agency: Star K Entertainment
Serial Drama Televisi:
- Sungkyunkwan Scandal (KBS2, 2010)
- The Man Who Can’t Get Married (KBS2, 2009)
- Strongest Chil Woo (KBS2, 2008)
- Shi Eun & Soo Ha (KBS2, 2005)
- April Kiss (KBS2, 2004)
- Sharp 1 (KBS2, 2003)
Movies:
- Wandeuki (2011)
- Sky and Sea (2009)
- Antique Bakery (2008)
- Boys of Tomorrow (2007)
- Shim's Family (2007)
Penghargaan Yoo Ah In:
- 2011 Mnet 20's Choice Awards: Hot 20's Voice
- 2010 KBS Drama Awards: Best Couple Award with Song Joong Ki (Sungkyunkwan Scandal)
- 2008 11th Director's Cut Film Awards: Best New Actor (Antique Bakery)
- 2007 8th Pusan Film Critics Awards: Best New Actor (Boys of Tomorrow)
- 2007 3rd Pyungtaek Pierson Film Festival: Best New Actor (Boys of Tomorrow)