Ryeoun, born Go Yoon-hwan on August 26, 1998, is a rising South Korean actor who has rapidly established himself as a versatile and compelling presence in the Korean entertainment industry. He is best known for his standout performances in a diverse range of television dramas, including 18 Again (2020), The World of My 17 (2020), Adult Trainee (2021), Twinkling Watermelon (2023), and the highly anticipated Weak Hero Class 2 (2025). Adopting the stage name Ryeoun, he has drawn attention for his ability to portray complex emotional arcs, often tackling roles that navigate the challenges of youth, identity, and personal growth.

Ryeoun made his acting debut in 2017, gradually building his resume with supporting roles in various television projects. His early work included appearances in About Time (2018) and My Country: The New Age (2019), where he began to hone his craft alongside established actors. However, his breakthrough came in 2020 when he was cast in the JTBC drama 18 Again, a fantasy-romance series based on the American film 17 Again. In the drama, Ryeoun played the younger version of the male lead, a role that required him to embody the spirit of a middle-aged man trapped in his teenage body. His nuanced performance earned him widespread recognition and critical acclaim, marking him as a talent to watch.

The same year, Ryeoun took on a leading role in the web series The World of My 17, a coming-of-age drama that explored the friendships and first loves of high school students. This was followed by another leading role in the 2021 series Adult Trainee, which further showcased his ability to handle mature themes with sensitivity and authenticity. In 2023, Ryeoun achieved a significant career milestone by landing his first and second television lead roles in the historical romance The Secret Romantic Guesthouse and the beloved fantasy drama Twinkling Watermelon. In Twinkling Watermelon, he played a central character who travels back in time to meet his parents as teenagers, delivering a performance that resonated deeply with audiences for its warmth and emotional depth. The drama became a sleeper hit, solidifying his status as a leading man.

Continuing his upward trajectory, Ryeoun is set to star in the upcoming second season of Weak Hero Class 2, the highly anticipated continuation of the action-packed drama that explores bullying and resilience in a high school setting. This role is expected to further expand his range and introduce him to an even broader international audience. With a growing filmography that balances youthful energy with dramatic gravitas, Ryeoun has become one of the most promising actors of his generation in South Korea. He remains active in the industry, consistently selecting projects that challenge him and allow him to connect with viewers on a profound level.