Stepfather and stepchild

It is thought that taking a concubine is to take care of the family and pay attention to the members to help the whole family have a new, happier life, but for the stepfather in the movie, it is different. He took a concubine mainly to satisfy his sexual needs, and it was none other than his wife's stepchild who helped him carry out this bad habit. As soon as I opened my eyes in the morning, noon came and then darkness covered me when everyone was asleep, all of these times were in the father and son's educational calendar. Even though the wife/mother was almost discovered many times, with the skill of making secret and very sophisticated lovemaking, the secret between father and son still cannot be discovered.