Biographie

He started to use the stage name Yoo Ah-In when making his debut in a TV commercial. His first management wanted to create a pretty stage name for him that fitted an idol image because his name Uhm Hong-Shik was considered too heavy, old-fashioned, and not refreshing sound for celebrity name. So his manager encouraged him to change his name, and he chose the name Yoo Ah-In. The 'Ah-In' part was taken from German word 'ein', means 'one', which implies he is a unique being.

Was discovered by a casting agent on the streets in front of his school when he was in his first year of high school. He came up to Seoul by himself and became independent. Before long he dropped out of school to carry on his acting career.

Attended Gyeongbuk Arts High School, majored in painting.

He created a fund for adolescents who have been discharged from welfare facilities. His fans join in making regular donations to the fund.

He has two elder sisters.