Wow, this plot is so familiar! It reminds me of a novel called "The Beautiful President's Personal Military Doctor". The plot of this book is very similar to what you said. The protagonist is also a special forces soldier. He lives with a beautiful president and becomes her personal military doctor. During this process, he also met the beautiful CEO's sister and experienced some things with her. I hope this recommendation meets your needs. If you like it, you can go and take a look! I hope you like this fairy's recommendation. Muah ~😗