Astonishing Dreamscape

The eldest brother studied Western medicine, which may have been arranged by his father, and he pretended to disagree, while the second brother ran away seeking revenge. The saying that a father's debt is repaid by a son may not refer to the biological father, but the adoptive father. The sister's words seem to be urging the protagonist to go along with her, because if she stays, she will be implicated as well. This house is full of secrets. He may have been influenced by something under the house, or he may have been directly killed by someone under the house.

Fiction requires logic, but reality and dreams do not.

People are similar to having past lives and present lives. We have experienced many such lifelines. Some dreams are memories deep in the soul. In such "dreams" our feelings will be very profound. After all, we have all experienced it personally. Our cognition in this life will affect the presentation of "dreams". For example, in a certain lifeline, you remember wearing a red princess dress, but because you have not worn or seen it in this life, in the dream you will be shown wearing the red dress you have worn...

Can someone please explain the plot? I can't understand it.