웹페이지 출력 오류

안녕하세요, 또 질문을 드리게 되었습니다.

오늘 배운 내용을 첨부파일 처럼 작성을 했는데, 실행해보니 웹사이트에 잘 적용이 되지 않네요...

여러 번 돌려보면서 대문자 소문자 철자 이런 것들 확인해보았는데, 혹시 잘못된 것이 있을까요?

const mapContainer = document.getElementById("map");
const mapOption = {
    center : new daum.maps.LatLng(37.554477, 126.97041),
    level : 3,
};

let map = new daum.maps.Map(mapContainer, mapOption);

let infowindow = new daum.maps.InfoWindow({
    zIndex: 1,
});

let markerList = [];

let ps = new daum.maps.services.Places();

searchPlaces();

function searchPlaces() {
    let keyword = $("#keyword").val();
    ps.keywordSearch(keyword, placesSearchCB);
}

function placesSearchCB(data, status) {
    if (status === daum.maps.services.Status.OK) {
        displayPlaces(data);
    }else if (status === daum.maps.services.Status.ZERO_RESULT) {
        alert("검색 결과가 존재하지 않습니다")
        return;
    }else if (status === daum.maps.services.Status.ERROR) {
        alert("검색 결과중 오류가 발생했습니다")
        return;
    }
}

function displayPlaces(data) {
    let listEl = document.getElementById("placesList");
    let bounds = new daum.maps.LatLngBounds();

    for (let i = 0; i < data.length; i++) {
        let lat = data[i].y;
        let lng = data[i].x;
        let address_name = data[i]["address_name"];
        let place_name = data[i]["place_name"];

        const placePosition = new daum.maps.LatLng(lat, lng);
        bounds.extend(placePosition);

        let marker = new daum.maps.Marker({
            position : placePosition,
        });

        marker.setMap(map);
        markerList.push(marker);

        const el = document.createElement("div");
        const itemStr = `
            <div class="info">
                <div class="info_title">
                    ${place_name}
                </div>
                <span>${address_name}</span>
            </div>
        `;

        el.innerHTML = itemStr;
        el.className = "item";

        daum.maps.event.addListener(marker, "click", function(){
            displayInfowindow(marker, place_name, address_name, lat, lng);
        });

        daum.maps.event.addListener(map, "click", function() {
            infowindow.close();
        });

        el.onclick = function () {
            displayInfowindow(marker, place_name, address_name, lat, lng);
        };

        listEl.appendChild(el);
    }
    map.setBounds(bounds);
}

function displayInfowindow(marker, place_name, address_name, lat, lng){
    let content = `
    <div style="padding:25px;">
        ${place_name}<br>
        ${address_name}<br>
        <button>등록</button>
    </div>
    `;
    map.panTo(marker.getPosition());
    infowindow.setContent(content);
    infowindow.open(map, marker);
}

<div id="placesList"></div>