Literature Reference: Departing, the guest has no fixed route; traveling, the boat is not tied. Source from 'Thinking of Traveling East: Fifty Rhymes'.
不: To signify negation, extraordinariness, and no regrets. With unwavering determination, it conveys steadfastness, capable of conquering all things.
系:
Connection: Involvement. Relationship.
Meaning: Being untied represents freedom and unconstraint, symbolizing a carefree and detached spirit from worldly affairs.