Giant stag beetle (likely artificially enlarged model)

Real stag beetles inhabit forests, woodland edges, and areas with decaying hardwood. This image appears to show a toy or decorative model indoors, not a live insect.

Adults generally feed on tree sap, fruit juices, or nectar; larvae consume decaying wood. Mandibles are primarily for male competition, not feeding.

Males use enlarged jaws in territorial contests and courtship. Adults are commonly active in warm months, including September in Korea, and may be attracted to lights.

They are harmless to people, though a large male can pinch if handled. Larvae help decompose dead wood; the pictured object poses no biological risk.