新老友旧知己
[xīn lăo yŏu jiù zhī jĭ]
This username combines the meanings of new and old friends. '新' (xin) means new, suggesting newly made acquaintances, and '老友旧知己' (lao you jiu zhi ji) refers to old and well-known friends, emphasizing a person cherishing both fresh and long-standing relationships.