Again (Attack on titan fanfic with NCT)

130 years have passed since Eren Yeager died. A long time later, a boy and his dog were walking through the forest and found a cave inside a tree. Since then, the titans have returned. Much of the population of Paradis has gone into exile on a mountain where the titans cannot reach, At least, not yet. The garrison, survey corps, and military police have returned. Everyone has returned. Everything is back to the way it was before. No one knows if the boy has become the original titan. No one knows where the 9 original titans are, or if they have really returned. Jung Yewon, Jaehyun's sister, is a cadet who gradually discovers a different feeling for Na Jaemin, who is also a cadet. This is a romance between Jung Yewon and Jaemin.