Liu Qingchen's coldness was caused by the environment, to protect himself; Mu Han's coldness was more due to nature.
In He Qing's eyes, Liu Qingchen was a lovely child who gave unreservedly to the people she trusted. Unfortunately, she inevitably got hurt in the end. But He Jing felt that Liu Qingchen was not someone who could be bullied by anyone, but she was a very principled person. In Mu Han's heart, Liu Qingchen is a special being, and a being that can make him feel at ease... However, to Liu Qingchen, they are a group of people who have taught her what friendship, trust, and love are, and they have brought her growth.