Wonderful show!First,I was delighted by how we are given these characters and they proceed to evolve in the following 17 episodes-none of them stay locked in,they change,as people should.Basically this big company is run by Mrs. Song(Grandma),her son Chairman Cha,her daughter Sook-hee Shin, and the two sons Ji-heon Cha(Ji Sung) and Mu-won Cha(Jaejoong-"Hero"). Ji-heon and Mu-won were first rivals in love with Na-yoon Seo,but now are candidates for Chairman Cha's position.Mu-won seems the perfect son,as Ji-heon has some problems.On a whim,Mu-won hires Eun-seol Noh(Choi Kang-hee)to be Ji-heon's personal secretary-she is the pretty,plucky,poor girl.So,Eun-seol begins to help Ji-heon,and a new triangle develops with the two young men and her-much to the stunned amazement of Na-yoon. There are many laugh-out-loud moments in this series,I found.An important tip is,at the end of episode 17-do NOT watch the previews of the next show-there's a huge spoiler image you don't need to see-( a big mistake on their part).DO watch this series-it's VERY good and worth your time.