Kence is far from being a saint. How could he let Eriel have his man? Kence already sacrificed and endured a lot of things for their relationship to work
If Kence were to give up Calter, that would not only be a loss but also a foolish decision in his heart. He knew that both of them can only be happy when they are together
If not, then living would cause them suffering
Fortunately, today's era is different than the past. In the previous era, if a rich and powerful's crimes were put into light, most of them would still suffer severe consequences
But now, no matter how vicious a person's act was, as long as they have enough strength, what can other people do? They simply have to destroy anyone that would want to hold them accountable. Things are as easy as that
If Kence has enough power, he can simply force the Lamine Family to hand out the Heart Pearl
Not to mention, Kence has a huge bargaining chip which was Eriel