Ren Lingling and Zhang Che have known each other since they can remember.
One is a little overlord in liberal arts, and the other is a little genius in science.
One has an extremely flamboyant personality, while the other has a gentle and jade-like personality.
One loves to eat, play and sleep, and the other loves to be quiet, paint and take photos.
Some say they are a perfect match, while others say they are incompatible.
They were close friends, neighbors, teachers and students, and brothers and sisters. No one thought that they would have feelings for each other.
Many years later, Zhang Che gave Ren Lingling a letter with only three words in it. Although it was not "I love you", it made Ren Lingling wipe her nose with tears.