Security Guard Falls in Love with Owner

The Heroine Is Independent but Not Withdrawn, Sober but Not Cold, Smart but Not Conceited.

I want to read a book similar to "Quickly Traveling Through Cannon Fodder She Doesn't Take the Ordinary Path". I beg you that the heroine's native family is very good, and there will be no changes later on, so she doesn't have to rely on the hero's heroine design. The heroine is not the kind of character who acts coquettishly and flirts with the hero, but is rational and emotionally stable.