Qianxu looks cold but is actually a complete coward. After accidentally hearing Gu Youyu's secret, he got entangled with him and couldn't get rid of him, and finally got himself involved.
The same is true for Gu Youyu. He has lost something he thought he cared about. Even though she doesn't want him, he still hopes to get her love. Gu Youyu used the most humble gesture to gain disgust, and ended up with bruises all over his body. He met Qianxu by accident. He thought Qianxu was an idiot and looked indifferent but was actually a coward. But later he became a coward and needed his protection.
Concept: Depression and anxiety can actually be cured. If one has enough patience, his world will definitely be filled with sunshine.