Jian Dan is a person who stutters because his parents died when he was young and he doesn't like to communicate with others. He is extremely lacking in love but never shows it. Gu Siyan's superior family led to his rebellious psychology, and he became a sinister person on the surface but gentle in reality.
Intention: No one is perfect. In real life, people tend to find the shortcomings of others. What we need to learn is to accept, understand and face