I am trying to understand how coroutines work

with bellow code, the UI is not freezing

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = ActivityMainBinding.inflate(layoutInflater)
    setContentView(binding.root)

    val scope = CoroutineScope(Dispatchers.Main)
    binding.root.setOnClickListener {
        scope.launch {
            delay(1000)
        }
    }
}

But with bellow code, the UI is freezing

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = ActivityMainBinding.inflate(layoutInflater)
    setContentView(binding.root)

    val scope = CoroutineScope(Dispatchers.Main)
    binding.root.setOnClickListener {
        scope.launch {
            myOwnDelayCode()
        }
    }
}

suspend fun myOwnDelayCode() {
    val date = System.currentTimeMillis()
    while(System.currentTimeMillis() - date < 1000) {}
}

Why does it happen eventhough i put “suspend” to my function?