Spring of Youth (Korean: 사계의 봄) is a 2025 South Korean teen romance television series written by Kim Min-cheol, directed by Kim Sung-yong, and starring Ha Yoo-joon, Park Ji-hu, and Lee Seung-hyub. It aired on SBS TV from May 6, to July 2, 2025, every Wednesday at 22:40 (KST).
Drawing dismal average ratings of 0.9% despite airing on a terrestrial television network, Spring of Youth is notable for being belatedly revealed to have been written by Kim Soon-ok, who earned the reputation of being a "ratings queen" for controversial and highly provocative melodramas such as Temptation of Wife (2008–2009) and its spiritual successor Temptation of an Angel (2009), Jang Bo-ri is Here! (2014), My Daughter, Geum Sa-wol (2015–16), and The Penthouse: War in Life (2020–21).
Contents
Plot
The series tells about a K-pop singer, Sa-gye, who is forced to attend a university campus. Forming a four-member co-ed band, he finds passionate love and music.
Cast
Main
Ha Yoo-joon as Sa-gye
Moon Woo-jin as young Sa-gye
A vocalist and guitarist of The Crown band.
Park Ji-hu as Kim Bom
Park So-yi as young Bom
Lee Seung-hyub as Seo Tae-yang
Nam Do-yoon as teen Tae-yang
Park Sung-Hoon as young Tae-yang
Seo Hye-won as Bae Gyu-ri
Kim Seon-min as Gong Jin-gu
Supporting
Jo Han-chul as Jo Sang-heon
The president of Jo & Jo Company
Han Yu-eun as Jo Ji-na
Sang-heon's daughter and is an artist manager
Cha Chung-hwa as Kim Ja Yeong
Bom's aunt who take care of her after the death of her mother
Kim Jong-tae as Seo Min-cheol
The hospital director and Tae-yang's father who had high expectations on him and considered music to be nonsense
Han Jin-hee as Yoon Seung-su
Sa-gye's manager
Kim Seo-ha as Kang Seok-hee
President Jo's secretary
Special appearance
Lee Won-hee as girl in the airport (ep. 10)
Production
Development
Director Kim Sung-yong, who previously co-directed My Dearest (2023), is in charge of directing, with Kim Min-cheol credited as the screenwriter. The series is produced by Studio S, FNC Story, and Monster Union.
A day after the final episode of Spring of Youth aired, Kim Min-cheol was belatedly revealed to be the pen name of Kim Soon-ok.
Casting
Lee Seung-hyub reportedly confirmed his appearance and began filming on November 4, 2024. On December 6, Hankook Ilbo reported that Park Ji-hu was starring as the female lead. On December 12, Jo Han-chul had confirmed his appearance. The next day, Seo Hye-won was reportedly confirmed her appearance. On December 23, Ha Yoo-joon, Park, and Lee were reportedly confirmed their casting.
Release
The series will air once a week every Wednesday at 22:40 (KST). However, its first and second episodes will air respectively on Tuesday, May 6, and Wednesday, May 7, at 22:40 (KST).