Sunny

Im Na Mi (Yoo Ho Jung) unexpectedly reunites with her old school friend, Chun Hwa (Jin Hee Kyung), in a hospital. Chun Hwa is now dealing with a lot, she's divorced, childless, and battling cancer. Chun Hwa expresses a wish for Na Mi to bring together their old group of friends before it's too late.

Na Mi agrees and begins a quest to find their long-lost friends, including Hwang Jin Hee (Park Joo Jin), Kim Jang Mi (Kim Min Young), Seo Geum Ok (Nam Bo Ra), Ryu Book Hee (Kim Bo Mi), and Young Su Ji (Min Hyo Rin). As Na Mi contacts each of them, memories of their past come flooding back, reminding her of their close-knit friendship group called Sunny.

Na Mi was the last to join Sunny, having moved from some countryside to Seoul. They shared many laughs and even faced other girl gangs together. But a big problem eventually drove them apart.

When they reunite, they reminisce about the good old days and catch up on their adult lives. Their school adventures have turned into precious memories. The friends feel a mix of sadness and happiness, brought back together by the unfortunate news of one of their own.