通过字符在字符串中的位置获取字符

package main

import (
    "fmt"
    _ "math"
    "unsafe"
)

func main() {
    var s1 = "한글"
    fmt.Println(s1[0]);
}

I want to extract string element like s1[0]. But I didn't get the correct element. Just returned number. I don't know the meaning of the number. I think there'is a library which is unicode/utf8. But I don't know how I get the correct value from the element using this. I want to extract '한' this word. Can you help me how I can convert?

</div>

package main

import (
    "fmt"
)

func main() {
    var s1 = "한글"
    var s2 = []rune(s1)
    fmt.Println(string(s2[0]))
}