夕阳西下落花季朝阳晨曦盛灿时
[xī yáng xī xià luò huā jì cháo yáng chén xī shèng càn shí]
This nickname expresses a sentiment about the contrast between different times of beauty in life, specifically the twilight (sunset) with fallen flowers and the brilliant sunrise. It signifies the transient yet vibrant nature of different phases of life, evoking both nostalgic melancholy and hopeful optimism.