Yi sang is a particularly quiet, mellow man. He fails to stand out much among his fellow sinners due to his tendency to stay silent and watch rather than actively contribute to discussions. On top of this, when he speaks, his words are often obscure and riddle-like whilst also delivered monotone. His expression never shifts much either, and he is yet to express any strong emotions.

Average height and build. He has short black hair which frays slightly at its ends, and dead-looking black eyes.