The story begins with the protagonist rookie PD Baek Seung Chan first day as a intern in KBS broadcasting company. He is here to learn the rope from the veteran producers. The reason why Baek Seung Chan chose to be an understudy in the variety division is because of his secret crushed on his senior in the same university. However, the senior did not even notice or remember his presence, and she even mixed up the details about him.
Seung Chan is definitely having a bad day during his first day of internship when his father imported car was accidentally scratched by Tak Ye Ji, the main producer for Music Bank. At first, she tried to escape from responsibility but was unfortunately caught in a film. It happens that the broadcast station is filming a documentary and Ye Ji immediately took down the contact number of the import car and stated that she intend to contact the driver regarding the payment for the damage.
She did not suspect that the expensive car could actually belong to a intern. Therefore, she called the phone and there is no response. In fact, she had commanded Seung Chun to switch off his phone while doing his internship with the rest of the students.
Tak Ye Ji soon encountered work problems with popular idol Cindy. She insisted to wear a lacy costume onstage, which was not allowed for broadcasting. No matter how hard she tried to persuade Cindy to put on more clothes, it went on death ears and Ye Ji have to pay the penalty for Cindy's actions. Frustrated, the tough cookie Ye Ji blacklisted her on the namelist and their conflicts begin. At the meantime, she has lost some of the respect from her subordinates due to this incident.
Ra Joon Mo is the main producer for 2 days 1 night. Due to some unforeseen circumstances, she is living together with Ye Ji and her brother in the same house. The house that Joon Mo lived in previously belongs to Ye Ji family. However, they sold the house to Joon Mo family due to financial difficulties.
Tak Ye Ji wanted to minimize the cost of damage which she had done to Seung Chan father car. However, due to pride she tried to put on a strong front and even asked Seung Chun to state the exact amount to pay. Taking her words by heart, Seung Chun actually demands for a high price for the damage to Ye Ji annoyance.
On the other hand, Ra Joon Mo is dating Seung Chun senior. However, he does not share the same interest as her. Dating is not his priority at the moment since his reality variety program 2 days 1 night received poor viewership and his production faced the possibility of getting axed by the management. He just reinvented the concept of 2 days 1 night with a group of middle aged ladies as hosts. Due to its poor viewership, he had to dismiss all the cast members to the disappointment of the whole team. Ra Joon Mo instructed Seung Chan to tell one of the most "difficult" to handle cast member about the change of cast which resulted in a hilarious miscommunication.
Cindy the proud idol did not appears to be bothered about her fanbase. She show her displeasure to others for "forcing" her to do things which she dislike. Behind her icy cold image, she actually appreciates people who are genuinely concerned about her. For example, she planned to join 2 days 1 night after Joon Mo bought some foods for her. Cindy encountered Seung Chan outside the KBS station during a rainy day. He sheltered her with an umbrella and insisted that she will return the umbrella at the reception. Soon after, she suggested to her agency to join the variety program 2 days 1 night.
Seung Chan was assigned to be attached to Joon Mo team to learn the rope. However, he keep making mistakes and received poor reviews from his seniors. The hardworking Seung Chan was instructed to try out all the games that the team thought of before they implement it. On the first day of filming, Cindy proved to be a miscast in 2 days 1 night. She lost the popularity vote among the celebrities. Therefore, she has to follow Seung Chan to film the games. As a result, the proud Cindy became closer to the dorky Seung Chan. It was hilarious that Seung Chan followed all the instructions strictly, thus making life difficult for Cindy unintentionally.
Cindy mentioned to Seung Chan that she has diffculties sleeping due to the stressful tight schedule as an idol. He suggested to her to listen to music and read a book before she sleeps. On the other hand, Seung Chan is learning the rope of an editor. As a rookie, he was assigned the duty to purchase lunch for his seniors which he screwed up initially. It was time to predict the rating for 2 days 1 night. Seung Chan wrote 6.8 which is the lowest prediction and it dampen the spirits of Joon Mo who has high expectation of this program. A flashback to Joon Mo hilariously made bad judgments of various things.
Seung Chan family were anxious to watch their son debut production and were surprised to see him on television with Cindy. It was another major shock when there was a editor error on the geographic location. The next day, the rating results came out and Seung Chan made the right prediction to the dismay of Joon Mo. To add salt to the wound, Joon Mo was ordered to write a report about this incident to the management too.
After a drink together at the company gathering, Seung Chan, Joon Mo and Ye Ji were drunk. The next day, Ye Ji remembered that she had confessed her feelings for Joon Mo. Flustered and worried, Ye Ji requested Seung Chan to investigate this matter. Initially, Joon Mo fake ignorance. However, Seung Chan managed to find out the truth eventually. Unknown to Ye Ji, Seung Chan has a crushed on her too. Staying close to Joon Mo house, Seung Chan often looked at Ye Ji lovingly.
It is a grand anniversary event for KBS station. The producers for all the variety shows were engaged to help out each other. Cindy is a guest star in the show and Ye Ji still have bad impression of her. During a rehearsal, Cindy almost get knocked down by the recording systems that is moving towards her direction. Ye Ji immediately pushed Cindy away, thus she was knocked down. Both of them were send to the hospital. Joon Mo and Seung Chan rushed to the hospital. It was a relief that both Cindy and Ye Ji escaped with minor injuries. However, Cindy mistaken thought that Ye Ji pushed her on stage. Joon Mo reprimanded Ye Ji for being thoughtless.
Seung Chan comforted Ye Ji outside the hospital. Through the conversation, Ye Ji realized the truth that Joon Mo was the least drunk on that day. He actually paid the all the bills, send the both of the back home and listened to their confessions. However, he pretended that he did not hear anything. Ye Ji was heartbroken that Joon Mo chose to edit that part of the memories. Thinking back to the good old days when they grew up together, Ye Ji cried as Seung Chan drew her closer to him.