Quick Transmigration: The Childless Male Lead Has a Child

[Mindless wish fulfillment, two male leads, no fixed pairing, everyone is pure]

The author wanted to read this kind of story, but nobody was writing one, so they decided to write it themselves.

Warnings: If this bothers you, please leave using the back button.

The author's writing isn't very good.

First world: real/fake

Second world: older brother/younger brother