In 2019, when Iwase was in his sophomore year of high school, a senior student took a picture of him waiting for a train and posted it on TikTok with the caption "My junior is cute", it quickly went viral and attracted much attention.
[1] In May of the following year, after the video of him gained attention, his Instagram account had amassed 170,000 followers, but he later posted that he was tired and would take a break from social media for the time being; he then deleted all of his social media accounts.
In August of the same year, Iwase was scouted by a talent agency and made his debut in the entertainment industry,[1] he joined the talent agency acali and made his debut as an actor under the stage name "Yuuki Ohsugi (大杉侑暉)".
[2] In September 2021, Iwase made his acting debut in the season 2 of the web drama My Graduation Project.
[5] In January 2024, Iwase appeared in the crime and suspense television drama Captured New Airport, as Naoki Tamba.