Embers of Ruins

Zhao Jin got a strange disease. Half of the time, I live in the apocalypse, with the red moon, ruins, and the lingering red mist; half of the time, I live in the old days, with childhood sweethearts, amusement parks, and perfect dinners. Both sides were true, but he couldn't decide which side was the truth. Until one day the old doctor told him: your childhood sweetheart does not exist. He desperately wanted to prove that the doctor was wrong. He opened the diary he kept at the end of the world, but after seeing all the contents inside, he found that she was the only one not in the diary.