The beautiful Mu Han, the indifferent Sonya, and the elegant Xi Yan, these three people have been leaning on each other for 4 years.
They thought they could stay together like this for the rest of their lives, but everything changed after Xi Yan met Sun Yang. In the end, Sonya and Mu Han went to Singapore, while Xi Yan stayed in Beijing with Sun Yang. This incident still made them all a little sad.
That period of sadness, which was neither big nor small, gave up friendship and lost love, which made them a little sad.