[A down-on-her-luck corporate slave transmigrates into the body of a young lady and meets a mysterious, gentle gentleman. The System says I have to win him over or I'll disappear?! Easy!] After a car accident, I transmigrated!? And turned into a rich family's young lady? On top of that, there's a System, and if I don't win someone over, the versions of me in both worlds will die!? Oh my god, I just want to live a normal life!
Huh? How did his affection level go up all by itself when I haven't done anything? Maybe I'm just naturally gifted? (Actually, the male lead is winning himself over.)
Later on, both leads are strong in their own right. The male lead is chaste. A female-oriented novel.