I have read it long ago and now i can't remeber it's name.

What i remeber is:
A president pick up a boy as his lover, but he dosen't know anything about his past. When he brought his lover to a party, that's where the lover saw his older sister. And it's reveled he's the hacker for his family company.

I'm not sure what the title is, but I think the mangaka is Fujisaki Kou

Thanks 🙂