He Chen is Qi Yu's best friend for 21 years. Two pairs of fun-loving parents instilled the concept of "partner" in the two of them when they were young, causing them to ignorantly believe that the other is their only one. During school, the two also used each other as an excuse to refuse to associate with others. Many friends think that they are talented and beautiful and will be together forever. However, Qi Yu had different feelings for another boy on her 21st birthday...
Intention: Face up to inner emotions and treat emotions rationally