Most people would assume it was the scar.

Actually, it was his eyes that first caught Song's attention. His eyes, which were hard and suspicious, like a vulnerable child's; for all that he was her age.

He stood at her door, eyes averted, mouth a thin line, fists clenched, voice harsh, body rigid with tension, as if expecting a blow.

And he asked for help for his uncle, standing at his shoulder and waving cheerfully, despite the pain of the rash appearing on his face.

It struck her forcefully then, warming her heart, that he was a very kind person.