Ko Eun-Bi (Ku Hye-Sun) is a medical student, but she dreams of becoming a musical actress. She thinks about musicals all day and even dreams about musicals at night. Hong Jae-Hee (Daniel Choi) comes back to South Korea. He used to compose songs for musicals, but now writes pop songs. His friend says that Jae-Hee changed because of his break-up with Bae Kang-Hee (Ok Joo-Hyun) 6 years ago. One day, Eun-Bi practices a song while out in a park and Hong Jae-Hee, who fell asleep in the park after drinking too much alcohol, is awaken by her singing. Jae-Hee tells Eun-Bi that he wrote the song "Maria Maria" that she is singing. Eun-Bi doesn't believe him. Jae-Hee advises her that without talent she shouldn't think of becoming a musical actress. Eun-Bi, ignoring Jae-Hee's opinion, decides to take time off from medical school to take part in numerous auditions. She fails all of them. With only 2 weeks left before she has to return to medical school Eun-Bi becomes desperate. She spots an audition advertisement looking for a male musical actor. Eun-Bi decides to take part in the audition dressing up as a man. Her ruse is discovered though by Yoo-Jin (Park Gi-Woong), an investor for musicals, and she is kicked out from the audition. In the bathroom of the audition, Eun-Bi meets a woman named Sa Bok-Ja (Park Kyeong-Rim). Bok-Ha insists she is a musical instructor and gives lessons to Eun-Bi. Bok-Ja even moves into Eun-Bi's apartment. Eun-Bi then decides to take a year off from school, believing that with lessons from Bok-Ja she can make her dreams come true.

Tokino Mitani runs a watch shop, located on a street far from the downtown area. She is 20-years-old and inherited the watch shop from her grandfather. Unknown to most, she is also an excellent private detective and offers an alibi cracking service. She can crack someone's false alibi by using logic based on time and a watch. She gets payed 5,000 yen for that service.

Yoshiyuki Saji used to be an elite police officer, but he tried to uncover corruption within the police department. This caused Yoshiyuki Saji to receive a demotion to a police station in a rural city. He moves alone there, leaving behind his wife and child. He lives at a boarding house, where Tokino Mitani lives. Yoshiyuki Saji does not get along with the other detectives there. He struggles to solve a case and he hears about Tokino Mitani's ability as an alibi cracker. He doesn't want to ask for her help, because of his pride as a police officer, but he requests her help on a case.

To.two is an extremely popular social media app with a catch; you can only get in based on invite. This web drama explores how this app creates social barriers between the students based on who can access the invite.

Based on the two historical events of "Yichang Retreat" in 1938 and "Shipai War" in 1943, the drama tells the story of the war of resistance that occurred in Yichang from 1938 to 1943.

When Yothaka's mother marries Chatcharun's rich father, Chatcharun is not happy. He believes that her and her mother are both gold diggers. Also, Yothaka has just returned from abroad and has a care-free "western" attitude. She is a rebel at heart, while Chatcharun is conservative. Along with believing she is a gold-digger, he also thinks she is "easy". She encourages that misconception just to annoy him. He harasses, she teases. They bicker. A lot.