"I miss you" was a poem from the Book of Songs. It came from the chapter of Guofeng·Zhou Nan·Guan Ju. This sentence meant," It's not that I miss you, but that you contacted me first." The cultural and historical background of this sentence is more complicated. The "I" refers to the poet himself and the "you" refers to the person he misses. In ancient literary works, this kind of poem often appeared to express the poet's longing for the other party. It was often expressed through the dialogue between the two characters,"I" and "you". In addition,"thinking" could also be interpreted as "nostalgia" or "missing". Therefore,"I miss you" could be understood as "It's not that I miss you, but you contact me first", which expressed the poet's nostalgia and longing for the person he missed.