"One Summer" (그해 여름) is a collaboration digital single between Wendy and Yang Da Il. It was released on July 2, 2018.
The music video was directed by HOBIN and produced by a HOBIN Film. Lee Seo Yeon (YG K+ model) and Park Woo Jin (Wanna One) were also casted for the music video.
- "One Summer (그해 여름)" - 3:59
- "One Summer (그해 여름) (Inst.)" - 3:59