Wi Ha-joon is a South Korean actor, model, and singer who is known for his roles in the Kdramas Romance Is a Bonus Book (2019), 18 Again (2020), and Squid Game (2021). He is also known for his performance in the South Korean films Shark: The Beginning (2021) and Midnight (2021).As a child, he was interested in music and dance and dreamt of becoming an entertainer or a boy group member. He was a member of a dance club in middle and high school.He had to study humanities instead of arts in high school because of his parents, who did not like his thought of working in the entertainment industry. When he was in the third year of high school, he wrote a letter to his parents expressing his views regarding his career choice. The letter was so touching that his parents rushed his transfer to a high school in Seoul. In an interview, he said, When I thought that I had to go to Seoul right away, I thought I had to put it into action. So I wrote a letter to my parents. I want to make my dream come true. After reading the letter I wrote with my sincerity, my parents rushed through the transfer process. I transferred to Seoul like that when I was in my third year of high school..The same year, he auditioned to become a trainee at SM Entertainment and JYP Entertainment in Tokyo. Ha-joon managed to pass the first round of auditions at SM Entertainment; however, after the camera test, he was rejected.While attending the acting academy, he watched plays and movies and began to develop an interest in acting. The first play he watched was Dont Be Too Surprised. The play was directed by Park Geun-hyung and performed at the Sanwoollim Theater in Hongdae, Seoul.In the second semester of his graduation, on November 28, 2011, he enlisted in Air Force Unit 709 in the Air Force Police Strike Team. He was discharged from his mandatory military service on November 27, 2013. After returning from the military, he signed with MSTeam Entertainment.After he joined his agency, the CEO of the agency told him to change his name. There were seven candidates for his name, and he chose to go along with Ha-joon, where Ha (Hwa) means to become and Joon means special, which went well with his surname, Wi.After appearing in the Coin Locker Girl (2015), he played supporting or minor roles in the South Korean films Bad Guys Always Die (2015), Anarchist from Colony (2017), and The Chase (2017).In 2017, he appeared as Ryu Jae-shin, Choi Seo-Hyuns (played by South Korean actress Lee Da-in) former driver, a role that made people take notice of him, in KBS2 drama My Golden Life. Wi Ha-joon in a scene from My Golden Life (2017).In 2018, he was seen in the South Korean found footage horror film Gonjiam: Haunted Asylum in which he played Ha-joon. His performance was liked by many, and he also received nominations for the Blue Dragon Film Award, Chunsa Film Art Award, and Grand Bell Award in the Best New Actor category. Wi Ha-joon in a scene from Gonjiam: Haunted Asylum (2018).