Oh Han Byeol is the Head of PR at Starforce Entertainment, and she is constantly nervous about their celebrities. Will they start dating? Will they get into a scandal? Her mind and body are a mess. She is overwhelmed with cleaning up after them that she hasn't got the time to find romance herself. What's worse is that the D-day she has been dreading is approaching. Their top star Gong Tae Sung is returning after one year in Africa.

The casting for "The World of Stars" by a top writer begins! Everyone drools for the lead role. However, Tae Sung, still deeply scarred by the incident six years ago, refuses Han Byeol's recommendation to take on the new project. Meanwhile, Tae Sung continues to grill Han Byeol, elevating everyone's curiosity about what happened between them in the past.

A picture of Han Byeol and Tae Sung as a couple in university gets revealed during the growing curiosity about their relationship, and rumors of them start to spread. Meanwhile, a company-wide stress questionnaire gets issued. During Tae Sung's fan signing event, Han Byeol gets shocked at Tae Sung's high stress index results. At that moment, Tae Sung starts to stumble, and she runs straight to him.

A humiliating video of Han Byeol gets shared online, and she becomes a YouTube sensation overnight. She's annoyed that it's all because of Tae Sung but worries about his stress level. The first shooting of "The World of Stars" begins! However, Tae Sung's new manager Jung Yeol ruins the mood on set. It's up to Han Byeol and the PR team to get things back on track.

Tae Sung sees Han Byeol with Soo Hyuk and he gets jealous. He tells Han Byeol to come to the set of “The World of Stars” every time there’s a shooting. An absurd rumor about Tae Sung breaks out, and Han Byeol does her best to prove it false. Later, Han Byeol visits her alma mater to give a lecture, and she learns of what Tae Sung did when a malicious rumor about her spread back in college.

Han Byeol's heart beats a little faster at Tae Sung talking in his sleep. Nevertheless, she brushes off any feelings for the top star actor. Later, a photo causes a love scandal involving Tae Sung and Da Hye. Meanwhile, Soo Hyuk tries to get closer to Han Byeol, and after the premiere of "The World of Stars", Tae Sung tells Han Byeol about the feelings he has inside.

Tae Sung realizes how he feels about Han Byeol. With Jung Yeol's help, Tae Sung tries every method of confessing his feeling to Han Byeol, but everything backfires. Meanwhile, Soo Hyuk makes his move and invites the PR Team to his home for a housewarming party. However, Tae Sung shows up uninvited.

Han Byeol has two guys after her, but it's not that pleasing for her. Meanwhile, Tae Sung stays upset at Han Byeol's reaction to his confession and starts to reflect on how it made her runaway screaming. Later, on the set of "The World of Stars," Tae Sung runs into his ex-girlfriend and realizes what he had done wrong, then collapses.

Han Byeol has dinner with Soo Hyuk and gets disturbed by the meaningful words he has to say. She resorts to her best friend Ki Ppeum and tells her about all the feelings she has inside for Tae Sung. Han Byeol finds her courage and heads to see Tae Sung in the middle of the night. Meanwhile, Ho Young's feelings for her senior friend Yu Sung begin to grow, and an unexpected relationship surfaces in the media.

Han Byeol and Tae Sung tumble into a sweet relationship. Tae Sung expresses his affection and challenges himself to change his tastebuds to everything she likes. Meanwhile, Ho Young finds herself deeper into Yu Sung as she has drinks with him, while Ki Ppeum's exclusive interview with Soo Hyuk leaves a strong impression. Meanwhile, the identity of Tae Sung's housekeeper gets revealed, shocking Tae Sung completely.

After the shocking ordeal with the helper, Myung Hee, Tae Sung receives another anti-fan text message. He begins to suspect everyone he trusted before. Meanwhile, Han Byeol starts to worry if her relationship with Tae Sung will stay special after meeting with Myung Hee, Ki Ppeum runs to Su Hyuk for legal help, and Ho Young keeps running away from Yu Sung after blurting out her feelings for him.

After the scandal that Tae Sung is having an affair with Eun Si Woo, he faints due to all the stress that the media is causing him. Although Starforce Entertainment is trying its best to protect its star, the rumor that Min Kyu tipped off has spread to an unstoppable point. The only solution that seems possible is to reveal Tae Sung’s true relationship with Si Woo, but it would break down his heart for sure.

Si Woo's emergency press conference that Han Byeol decided to do gets underway. However, Tae Sung feels a little disappointed at Han Byeol's decision. After the press conference, the criticism against Tae Sung slowly dies down. But due to the disparities, Han Byeol and Tae Sung can't approach each other readily. Meanwhile, Yu Sung replies to Ho Young's feelings, and Ki Ppeum realizes her sentiment toward Soo Hyuk changed.

Starforce Entertainment employees meet up at Organic to remember Yoon Woo's passing. Tae Sung, who has made up his mind to confront the culprit of the letters in the red envelope, also heads to the bar. Meanwhile, Han Byeol finds out who the employee card belonged to that got posted on Tae Sung's anti-fan cafe, Ki Ppeum reveals her feelings to Su Hyuk, and Ho Young becomes anxious regarding Yu Sung's popularity among women.

Han Byeol struggles to keep her relationship with Tae Sung a secret. Tae Sung thinks of an ingenious way for them to stay together. As they enjoy their office relationship, Tae Sung realizes he doesn't know much about Han Byeol and starts to investigate. Meanwhile, Yu Sung proudly reveals his relationship with Ho Young. And Ki Ppeum meets Soo Hyuk in the most unexpected place.