Summary:

After the death of Superman in 2023, Conner Kent is left to pick up the pieces he left behind. At 17 years old Conner is expected to defend Metropolis from invaders, parent his younger brother, maintain a healthly relationship, and somehow live up to the name of a father he always seemed to disappoint.
At 17 Clark Kent was expected to finish his homework and avoid getting caught messing around with his friends.
When a new threat to the Justice League sends Conner and Jon back in time everyone realizes just how different Clark and Conner's realities have always been.