Sorry first time posting and don't know if I can put this in here.  Please let me know if not or if there is another forum. I have been up all night now trying to find. It is Korean, likely 2000s. It starts with a girl finding out her boyfriend is cheating with her best friend. However, the best friend is a key character in the show and will stay with the show throughout the series and is actually quite nice. 

She goes to work and her previous boyfriend turns out to be her boss. 

The main thing was the female lead had trauma from when she was going to have sex for the first time and her crush left and walked out in the rain. She watched him go from the hotel room and she was very sad and from then on always thought she was unpretty. 

It always makes me feel better - as we all know from people who have broken our hearts how they make us doubt ourselves. 

Extra info- it is love square, her boss buys the place next store to her and I think they get caught dating once in the car. She is very clean, her love interest and her met in the library at uni and her and him are often said to male and female versions of each other.  It was just a very cute show and if anyone knows it - please reply !