Dark Shades x Seonghwa FF

Who is this Park Seonghwa, and why does he provoke this sensation on her, that she's never felt before? He seems dark, mysterious and intimidating, not the type of person you'd easily walk up to and talk to him. He seems so scary, that hard expression on his beautiful face was enough to make her tremble inside and out.
Maybe it meant stay away from him, because he only means trouble and danger. But something about him invited the curiosity of wanting to know more of him...even if just glancing at him gives her goosebumps all over because of how frightening he looks...
Surely there must be more than meets the eye, right?