[citation needed] Kim Jae-won made his debut as a fashion model in 2018,[5] and subsequently commencing his acting journey in 2021 with the Filipino-Korean web series Love From Home directed by Kristel Fulgar (a Filipino actress and singer), and later appearing in the series titled Romanced.

[6][7] In 2022, Kim made his notable appearance in the television drama Our Blues on tvN, portraying the character of a young Cha Seung-won.

[8] Continuing to demonstrate his talent, he was then cast as the lead protagonist, Je Soo-oh, in the EBS television drama Fall For You.

Excellently portraying the role of a beloved high school student, which he effectively embodied the image of first love.

[9] In the year 2023, an additional invitation was extended to him, presenting an opportunity to showcase his talent in the renowned television series Stealer: The Treasure Keeper on tvN.