It's good acting, but slow pace of the drama.
My opinion about the story mainly is that parents should never prohibit a relationship between two people because of social status, and use their social power to separate two human beings. For me the problem starts there. Also, to marry for convenience, or to gain a higher position is also a betrayal, to the person you are marrying and to yourself and the children that will come in the future and will pay the price of a loveless marriage. As a consequence, these two lovers never had closure and feel justified to have an affair and continue the path of betrayals, and the desperate need to be happy at all costs.