Do Kyungsoo and Park Chanyeol were very in love. Nothing could separate them. Their love cannot be broken. They loved each other to death.

Others could not accept this kind of love. They were disgusted. Especially Chanyeol's mother. She was very disgusted. She could not accept that Chanyeol loved Baekhyun to death. She did not understand love at all. She tried all kinds of things to break them apart but failed. Until one day, she decided to send him abroad, for one year. Chanyeol and Kyungsoo developed a long-distance relationship but it failed. Chanyeol broke up with Kyungsoo.

Kyungsoo still loved Chanyeol to death. He cried and cried and avoided contact with even his friends. His parents were worried about their son. Kyungsoo finally went out of his shell and lived normally with still a broken heart. In the other hand, Chanyeol dated other women and avoided men. Chanyeol's mother is satisfied as Chanyeol wanted to stay in the U.S more longer.

After a few years, Chanyeol finally goes back to Korea. Fate brings Kyungsoo and Chanyeol together as they work together  in the same company. Kyungsoo still remembers Chanyeol clearly but Chanyeol doesn't even recognise his ex-lover's face. Kyungsoo knows him as his ex-boyfriend while Chanyeol knows him as his workmate. As time flies, Chanyeol remembers him bit by bit.

Will they fall in love again?

Or will they just remain as workmates?