seek·er
/ˈsēkər/
noun
noun: seeker; plural noun: seekers
a person who is attempting to find or obtain something.
"a tenacious seeker of the truth"
mys·te·ri·ous
/məˈstirēəs/
adjective
adjective: mysterious
difficult or impossible to understand, explain, or identify.
"his colleague had vanished in mysterious circumstances"
(of a location) having an atmosphere of strangeness or secrecy.
"a dark, mysterious, windowless building"
(of a person) deliberately enigmatic.
"she was mysterious about herself but said plenty about her husband"
Origin
late 16th century: from French mystérieux, from mystère ‘mystery’.