'True binary stars are two stars held together by one another’s gravity.'

Chanyeol had always liked annoying Joonmi. He finds her reactions entertaining. Even so, he feels that it is also his job to protect her. To Chanyeol, no one else can annoy her.

After a spending a long time apart from each other, Joonmi grew to become an independent young lady. When Chanyeol and Joonmi finally meet again, she tries her best to stay away from him to stop him from annoying her. But while staying away from him, she finds herself getting more and more involved in his life, and him becoming more and more important in her life.