Mumu's House is a small shop that sells stories and fulfills wishes for "people".
While the shop owner Irene is creating illusions for others and giving others a happy ending, she is also creating illusions for herself and creating a happy ending for herself.
As long as you don't want to wake up from your dream, no one can do anything to you. And such a spell is not unsolvable. The only way to break her spell is to realize that she is in an illusion, otherwise no one can get out, including Eileen herself.
Eileen is the ancient god of illusion, coexisting with heaven and earth, immortal and immortal. She has powerful magic and can create large-scale illusions, but she was hurt by love. In despair, she spent her divine energy to create an illusion for herself, called Mumu's House.