烟笙如故
[yān shēng rú gù]
The username '烟笙如故' (which can be literally understood as 'Pipe Smoking as Old') probably intends to convey an enduring, unchanging friendship/scene/feelings through metaphorically depicting something like tobacco habits, evoking a picture of good-old-day memories continuing on in present moment, thus highlighting an unchanged and nostalgic emotion