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.