An insert assembly inserted in a gap region provided in a panel to fill the gap region, the insert assembly including a body unit covering the gap region not to be exposed to the outside, an insert unit extended from the body unit and inserted in the gap region, and a hook unit extended a preset distance from the insert unit toward the body unit, the hook unit comprising one end connected to the insert unit and the other end provided as a free end, wherein the body unit, the insert unit and the hook unit are integrally formed with each other as one body.