Trying to find a Kdrama from a while back (watched around 2010) but cannot find it. 

General plot is poor guy finds out hes heir to a big company and also tries to win the heart of a girl who beats him up a lot. Character details of show I can remember: 

- Grandson to a female chairman of the company dies, the the grandmother starts to look for lost grandson as they are the only heir left. 

- ML is the heir to the company, but he was born out of an affair or something and instead lived with his mother and grew up not knowing his family. 

- FL works at supermarket, and likes to fight or beat up ML. She lives with her family and ML ends up staying with them as he tried to run away from people looking for him. 

- SML works at the company. He bumps into FL when they first meet and she spills coffee on him or something. 

- SFL is secretary/helper to ML. Training him to be future CEO. Some scenes show her with kendo.   

Thanks


Edit: its Oh! Pil-seung and Bong Soon-young.  

I kinda liked the plot, if u find out, dont forget to mention it =D 

Sounfs a bit like Shopping king Louis ..but its too old to be that drama if its from 2010...

Found it, its Oh Feel Young or Oh! Pil-seung and Bong Soon-young.