Gu Ying feels pity for himself
Source: Lu Ji of Jin Dynasty's "Going to Luo Daozhong to Work": "Standing and looking at his hometown, Gu Ying feels sorry for himself."
Allusion: Gu : Look; pity: pity. Look back at your own reflection and feel pity for yourself. It describes the appearance of loneliness and frustration, and also refers to self-appreciation.
Moaning without illness
Source: Song Dynasty Xin Qiji's "Linjiang Immortal" lyrics: "A hundred years of prosperity and a hundred years of heart, more joy must sigh, even without illness, groan."
Allusion: Moan: a low hum when in pain. It's okay to hum. It is a metaphor for sighing when there is nothing worth being sad about. It also means that literary and artistic works have no real feelings and are just pretentious.