Minna, I've been searching this title of manga.

It's about a heir of a company. At first he was in the selling department and then move to marketing department. He was in love with his senpai at the company, which is one of his father right-hand. This senpai is a widower, and I remember that his wife is actually his colleague at work, but they got divorced because they were too busy with work.
This senpai is actually someone who was familiar about ten years ago, when he was still in high school.
They're in love with each other and finally living together. The scene that I remember the most is when the father found out about them because he saw his son's shoes at the front door, and open one of the room.

Is it clear enough?
I really forget the title, and I want to put this manga in my 'FAVE MANGA' folder.

Could you guys please help me?
Thank you...

Doushiyoumo Nai Keredo?

Owh, you got it right... Thank you so very much...
My files is almost 75GB with hundreds of Manga scattered, not yet arranged, so it's a bit difficult to scan them...
Thank you~