Rain Falls in Chang'an and Tears Turn into Poems

Her best friend shot a video of a rainy day in Youzhou, and asked Liu Shiran to write the lyrics for the music, which brought her mind back to Xi'an 12 years ago, when she broke up with her first love Jiang Feng in the rain, so she went to Xi'an again. By chance, time reversed, and she went back to 12 years ago, trying to change the ending with Jiang Feng...