"Sudden Shower" (Korean: 소나기; RR: Sonagi) is a song by fictional musical band Eclipse, consisting of Byeon Woo-seok as vocalist, Lee Seung-hyub as guitarist, Yang Hyuk as bassist, and Moon Yong-suk as drummer, from South Korean television series Lovely Runner (2024).

It was first released on April 8, 2024, as part of the EP Lovely Runner OST Part 1, and later included on the soundtrack album to the series.

Fictionally, "Sudden Shower" is a self-written and composed song by Ryu Sun-jae (Byeon Woo-seok), in the time slip romantic comedy television series Lovely Runner.

The song was inspired by the memories of his first love, Im Sol (Kim Hye-yoon), before he embarked on his music career.

[1] "Sudden Shower" peaked at number four on the South Korean Circle Digital Chart and number 167 on the Billboard Global 200.