In the far north, there is a beautiful legend that those who see the Northern Lights are the happiest people appointed by God. Growing up in the same orphanage, Sang Yu and Dong Yu had completely different destinies. Dong Yu chose to leave, while Sang Yu chose Yu to stay.
A forest fire invaded Sang Yu's hometown, and countless people were killed and forced to migrate. Sang Yu followed teacher Huisheng to the south, where she met Dongyu, known as the "little prince". They had similar suffering experiences and became good friends who talked about everything. They agreed to see the Northern Lights during the summer solstice.
Not long after, Dong Yu misunderstood Teacher Hui Sheng because of the mystery of his life experience. He resolutely left the orphanage with a Korean couple, and his whereabouts are unknown ever since. After he left, Hui Sheng also became ill. Before Hui Sheng died, he gave Sang Yu a letter about the mystery of Dong Yu's life experience, and asked her to swear that she would personally deliver it to Dong Yu.
Twelve years later, Dongyu has become a popular idol star in Asia, and Sangyu has become an ordinary factory worker. She went to autograph sessions several times, and met with him at concerts. Those young promises, waiting, missing, have the shelf life of love passed, and memories have become luxury goods? In the end, in desperation, Sang Yu gritted her teeth and entered the entertainment industry by participating in the talent show. From then on, she was plotted and deceived, and power and money would surround her...