The city "Cloud City" is an ordinary city with special rules hidden. 99% Of people cannot perceive "emotional energy", but a few people (called "Weavers") can transform their own/others' emotions into concrete "emotional threads" - different emotions correspond to threads with different attributes (such as joy = golden warm threads, sadness = light blue cold threads, anger = red burning threads, obsession = jet black tough threads).
Purpose of emotional threads: Weavers can form temporary abilities by "weaving" threads (such as warm threads to heal small wounds, cold threads to cool down, burning threads to ignite fires), but excessive use will consume their own emotional perception (become numb in the short term, and may lose the ability to empathize in the long term); when a certain amount of threads are accumulated, "emotional crystals" can be condensed, and the crystals can be traded by special groups, or trigger "emotional nodes" hidden in urban corners (such as old bookstores, abandoned platforms, and late-night cafeterias).
Limitations: Emotional threads cannot directly harm others (burning threads can burn the skin at most and cannot be fatal), and can only transform "real emotions" (pretended emotions cannot form threads); the strength of a weaver's ability is positively related to its own empathy, and cold-blooded people cannot become high-level weavers.
