Du Yun'en, who was living under the shelter of others after his parents died, returned to his hometown of Yupo Town after his grandfather became seriously ill, and unexpectedly met his brother's friend Chen Zhiyou. When they first met, he had a very bad impression of Chen Zhiyou, who had dyed hair and a scornful air, and believed that he was a "fake gangster" who was ignorant and incompetent. Later, due to psychological problems, Du Yun'en transferred to Yupo Town to study. In the new environment, he met a group of sincere friends, and gradually changed his mind through frequent interactions with Chen Zhiyou - this seemingly cynical young man always calmly lends a helping hand when he is in trouble. Du Yun'en regarded Chen Zhiyou as his most important friend, but he never noticed the deep secret love hidden in the laughter and fun. Chen Zhiyou chewed this love that he dared not express in his mouth over and over again, swallowing it full of sourness. Until time goes by, Du Yun'en understands his sincerity in daily life, but this belated affection is destined to find the direction of getting closer again with regret and sourness.
Purpose: Self-salvation under the trauma of the original family, the sourness of secret love and the healing of two-way running