At the age of twenty-six, Chen Xubai's technology company is already operating steadily. On the day he was invited to return to his alma mater, he accidentally opened a rusty iron door on a deserted rooftop - what was behind the door was not the familiar city skyline, but a silent corridor full of blue irises in another time and space.
He became a teacher at this high school. During the day, he teaches rigorous code logic, and after dusk, he steps alone on the other side of the door to explore the unfinished legacy of youth that only exists in a parallel world. One evening, in the desk of that world, he discovered a paper rose whose traces had been smoothed by time.
He knew that some doors, once opened, could never be closed again. Just like some encounters, even if they cross the torrent of stars and data, they are only to repay the unspoken tide between one flower and another.
