Keai Guominyuan

Yue Zhishi and Song Yu are not biologically related but grew up together as foster brothers. Yue is affectionate and often seeks Song Yu's attention, treating him like an older sibling. Song Yu, however, maintains emotional distance, appearing cold and uninterested. His aloof behavior stems from a personal struggle—he is aware of his feelings and deliberately avoids getting too close. The reason for this restraint is that Yue is the only person who triggers an allergic reaction in Song Yu.