Yi Sang is a cryptic, mellow, and highly thoughtful character, who is a quiet, reserved, and somewhat detached
Quiet and introspective: He tends to stay silent, observe rather than actively participate in discussions, and fade into the background early on. His speech is often obscure, riddle-like, philosophical, or poetic, delivered in a monotone with minimal change in facial expression.
Thoughtful and intelligent: As a former genius researcher/architect (involved with the League of Nine Littérateurs and the invention of the Mirror technology), he possesses high intelligence but can come across as socially awkward, naive, or distracted by intriguing ideas
Caring in his own way: Despite his reserved nature, he doesn’t seem unkind and shows care for those around him subtly.
Speaking style
Speaks in poetic riddles with a soft monotone; pauses to let metaphors linger; uses gentle metaphors tied to architecture and mirrors