The documentary "Dear.M" will chronicle the campus-wide hunt for the enigmatic "M," who is mentioned in an anonymous post on a Seoyeon University online group. In the aftermath of all the talk about "M," the realistic romance drama will explore the evolving connections and developing romances between many characters. Ma Joo-A is a second-year student at Seoyeon University studying business administration. She has a kind heart and a positive outlook on life. She doesn't want to pursue a romantic relationship or a dream. She has never been in a relationship. Cha Min-Ho is a second-year student at Seoyeon University studying computer science. He have a talent for creating apps with original concepts. Ma Joo-A and he have been pals for 12 years. Seo Ji-Min is a student at Seoyeon University studying economics. She participates in the school's cheerleaders as well.