This is an imaginative situation, but my response may not be innovative at all. I think the natural and prompt response is to ask "Who are you?" or "Where am I" or something like that; then I may notice his appearance, manner, figure and so on, perhaps I will regard him as an angel.
I'm afraid i can't say anything by seeing such a handsom face~(20084262018887556) but if i should say something,maybe I'll ask the same question just like aom do when they first met in the tv series"the princess ":Are you real person? God ~you're too perfect to believe you are reality!