遗憾是蝴蝶飞走的落幕曲
[yí hàn shì hú dié fēi zŏu de luò mù qŭ]
Expresses the feeling of regret using imagery from a butterfly flying away at the end. Regret or sorrow are symbolized as ephemeral beauty slipping away, emphasizing feelings after losing something special. This poetic nickname reflects on endings filled with both beauty and sorrow.