S Sad was a romance novel that described the emotional entanglement between a male best friend and the female lead. In the novel, the relationship between the male protagonist Dongdong and the female protagonist was that when the male protagonist was in a bad mood, he would often lie on Dongdong's shoulder and cry. Dongdong would also silently protect her and help her relieve her emotions. This behavior is usually seen as an emotional exchange between male friends/couples, but it may also cause discomfort or misunderstanding from other readers. Therefore, when reading such novels, readers are advised to judge and choose according to their own emotional experience and values.