[4] Ha Seok-jin was born in Bangi-dong, Songpa District, Seoul, South Korea in 1982.

He entered the Department of Mechanical Engineering at Hanyang University and after completing his first year, he enlisted in the military.

After completing his military service as Combat Police in year 2002, Ha Seok-jin returned to school.

But eventually, he decided to give it a try and made his debut in the entertainment industry through a Korean Air advertisement in 2005.

[6][7][8][9] Although he didn't plan on pursuing acting as a career, he found it enjoyable and became increasingly attracted to it.