First of all, the story of the series is very interesting, especially if you are interested in stocks. Especially the sections that are given at the end of each section are very useful for you.
Secondly, I like the acting of the actors, especially the main role of Mrs. and Kang Sun.
Thirdly, the little romance that he has is also attractive.
Fourth, I am very happy that Song Kyu sang the OST for this series. It had been a long time since I listened to new music from him, and this OST made me feel better