In "Detective Star" 202 10202, Vision Wei and Angel formed a "perfect" cp, and their stories were impressive. Later, during 202 10202, Angel returned. Vision Wei specially sang "Perfect" to welcome her, and Angel cried on the spot.
In the storyline of 200210202 Star Detective, Vision Wei and Angel are a couple, but the captain played by Vision Wei gave up the stewardess Angel for his future, and Angel chose to let go at this time. What she means is that you can only choose perfection at this time.