Once He Traveled Through Time, He Became the Little Mother of His Classmate

An accident before the college entrance examination caused the classmates to travel together to an imaginary era, and accidentally became the concubine of the classmate's father. After some dealings, their identity changed from a little mother to a best friend. The two classmates cooperated with each other in a different world, struggled together, jointly created their own wealth and freedom, and found their ideal partner!