Oh Sehun, the CEO of Two Moons Designs, had been going through a lot of things in his life, things he didn't even want. For instance, getting married was the last thing he wanted. His life was a complete mess in his eyes and he apparently had no idea how to clean that up.

Kim Sarang, a fresh graduate from her university, was looking for a decent job since she was very against the idea that her boyfriend should take care of all her expenses. She ended up attending an interview for a post in the Two Moons Designs and got chosen as the personal assistant for the very strict CEO. 

Park Chanyeol, the ever so sweet boyfriend, couldn't ever speak against his girlfriend because he just loved her so much. He was an architect and did a lot of travelling but . Leaving Sarang behind made him worry and now that she was going to start working, it only added to his concerns.