In the previous web novels, the male protagonist was locked in a house and could not get out. He repeated the same life every day and killed the same person. This plot was usually called the " imprisonment plot " or " trapped plot." This kind of plot often appeared in novels, movies, television dramas, and other works to portray the protagonist's helplessness, despair, struggle, and other emotions. At the same time, it could also show the protagonist's growth and change. The protagonist in the imprisonment plot usually experienced various challenges and struggles in an attempt to escape from the place of imprisonment or to find a chance of survival. This kind of plot was often used to explore topics such as human nature, freedom, and restraint. In some works, the protagonist might finally escape from the prison through tireless efforts and courage to gain freedom and grow up. In other works, the protagonist might be trapped in a prison and eventually fall into despair and collapse.