Replace LiveData with EventBus in multi activity

Currently my project used EventBus to post event and I am trying to replace LiveData with EventBus. In theory, they work similarly. I migrated without no pain in the beginning. But it comes up a scenario I have no idea how to deal with it.

And here's is the scenario.

LaunchActivity -> PersonInfoActivity -> UpdateInfoActivity

Currently We use EventBus to subscribe UserInfoEvent in LaunchActivity and PersonInfoActivity

LaunchActivity.java

public class LaunchActivity{
     @Subscribe(threadMode = ThreadMode.MAIN)
     public void onEvent(UserInfoEvent event){

     }
}

PersonInfoActivity.java

public class PersonInfoActivity{
     @Subscribe(threadMode = ThreadMode.MAIN)
     public void onEvent(UserInfoEvent event){

     }
}

UpdateInfoActivity.java

public class UpdateInfoActivity{
     public void onSubmit(){
          EventBus.getDefault().post(new UserInfoEvent());
     }
}

And the question is , I want to use LiveData to replace this scenario

What I have done?

I have read about the question about singleton usage with livedata Room - LiveData observer does not trigger when database is updated, I want to try to use the same way but no luck. The Event is fire everytime in onChanged() when I started the Activity

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