號蓝色再见
[hào lán sè zài jiàn]
Interpreted as 'Saying goodbye to the sky blue', 'blue' might suggest melancholy feelings when parting ways or reflecting upon a change. 'Sky blue' could metaphorically represent endless possibilities or freedom. Therefore, this implies bidding farewell to hopeful aspirations associated with clear skies, signifying sadness at moving forward from something beautiful yet unattainable.