Help me find a manhwa

This one has a girl who was adopted but she is torn between fulfilling her duty as the adopted daughter versus being with the son of the adopted family. If I remember correctly. And the son and her both work in the same family's (?) company??? It's a modern romance. Seems like they have a lot of sex. The first chapter opens with it. Idk if the guy likes her or is just lustful and controlling. The have been having this sexual relationship without the romance (from that one chapter I'd read). He basically calls her to his office I think? And she was "late" so she needs to be punished or something like that. I - I have no idea. It opened with his coming back from somewhere and calling her over. It was an office setting. At the time I thought it was too dark and skipped over it. So it's not quite an office relationship since they grew up together. But he seems to be mistreating her and seems like she can't say no to him. She seems sad. Idk since was only the first chapter or so. He said, if you hadn't come to me I would have come to your workplace and fucked you there. Would you rather have that?!? I think he ripped her leggings and you know, they did the fwop fwop.