Me and You in the Morning and Evening Line

After the earth stopped rotating, the world was divided into eternal day and night. A boy from the day world and a girl from the eternal night world meet through an underground tunnel and discover that each other's heartbeats can weakly push the earth. They decided to embrace at the junction of the dawn and dusk lines - for an instant the earth's axis trembled, and the two turned into eternally rotating particles of light, becoming the first ray of dawn to restart the world.