Park Hae-joon started his acting career on stage before making his screen debut in 2012 through the film Helpless and the KBS2 sageuk Jeon Woo-chi. In 2014, he played supporting characters in the SBS medical thriller Doctor Stranger and the tvN workplace drama Misaeng. In 2015, he starred in director Jung Ji-woo’s film 4th Place, which earned him acting nominations at the 25th Buil Film Awards and the 4th Wildflower Film Awards. In 2018, he appeared in the action crime film Believer, which gave him Best Supporting Actor nominations at the 27th Buil Film Awards and the 55th Baeksang Arts Awards. In 2020, he acted alongside Kim Hee-ae in the top-rating JTBC series A Couple’s World, which scored him an Excellence Award at the 7th APAN Star Awards.

Park Hae-joon majored in theater studies at Korea National University of Arts. In 2020, he married actress Oh Yoo-jin, who attended the same university as him.