Literature Reference: 来书细作行。——《别常征君》 In the letters, details are carefully written. Source from 'Bie Chang Zheng Jun'.
作: To engage in work, to labor.
行: Proficient in a certain matter, it generally signifies smooth progress in all affairs, with the character "Zhi" carrying auspicious connotations.
Meaning: It signifies meticulous writing, embodying hope for the future and determination to move forward.