Vue Korean input bug

HTML

<div @keydown="handleKeyDown" id="app">
	<input @input="handleOnChange" />
	<div>
		pressed key detected by keydown
	</div>
	<ul >
		<li v-for="log in logs">{{log}}</li>
	</ul>
</div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

del {
  color: rgba(0, 0, 0, 0.3);
}

Vue

new Vue({
  el: "#app",
  data: {
		logs: []
  },
  methods: {
    handleOnChange(e) {},
    handleKeyDown(e) {
      this.logs.push(e.key);
    }
  }
})