When the University where Shen Wei works organizes a secret pen pal experiment, his colleagues immediately write down his name as a participant.
He doubts that he will go further than the four mandatory letters and he is mostly going to assuage the professors.
However, his secret draw seems to be a very bright and interesting man who just begs to be loved.
They both begin to share secrets and words that have never been uttered out loud and their relationship grows stronger by the letter.
However, one day Shen Wei meets Zhao Yunlan again, and whilst he is ready to drop his pen pal relationship, his pen pal has also met a very cute and weird professor and he's falling in love quickly!
Yes. This is a love square!