红尘的战场

This is translated to 'the Battlefield of the Mundane World' where '红尘 Hongchen' (meaning 'red dust') represents hustle and bustle, vanity, and material world affairs, often used to denote society full of human desires and competition; and '战场 Zhanchang' denotes battlefields. This nickname reflects someone seeing social interactions and competition as battles on a grand scale, emphasizing the challenges of navigating daily life amidst societal competition and conflicts, or possibly indicating they've been through tough experiences and regard life like a battlefield.