Zhou Kunpeng in Black Butterfly is a simple teenager in ignorance. His first half of life was just a simple painting, simple and simple. At that time, Qi Lin was a sober and free woman, and she could let go. Her appearance is like throwing a boulder at Zhou Kunpeng's dull life, which makes his youth splash for the rest of his life. I think at the beginning, Zhou Kunpeng was curious about Zhi Lin's feelings with a hint of guilt, because the insertion of her sister-in-law made Kirin divorce, and Kirin's experience made Kun Peng extremely curious. After a period of getting along, Qi Lin's beauty once again attracted the attention of Kun Peng, and he began to observe her constantly, which made Kun Peng more attracted to her. At the same time, my sister-in-law has formed a family, and she has no more energy to take care of him. He has no friends, and the only person she can rely on now is Qi Lin. And because Kun Peng has a sense of insecurity in his heart that he is afraid of being abandoned, it makes his feelings for Lin deeper and deeper, just like a moth to a fire, without hesitation. However, the social environment, age gap and identity background at that time made it impossible for two people's feelings to continue aboveboard. After being imprisoned again, Qi Lin tried to stop this feeling, but it became the most beautiful thing in Kun Peng's heart. At the end of the film, Kun Peng's exhibition of paintings and the letters he wrote but didn't send recorded the dribs and drabs when he got along with Qi Lin, which was also the most unforgettable and beautiful youth in his life.