What makes him stagnant at 19 is a 20-year-old soul.
Once upon a time, there was a child named Yu Yan. He was abandoned when he was born, but luckily the old director of the orphanage adopted him. When he was 11 years old, he met another child, Jiang Han. Unfortunately, Jiang Han at that time didn't seem to really want to be friends with Yu Yan?
If you want to know what happens next, listen to the explanation next time.
Intention: to be a good person