Translation:Oh, that man's name is not in the entrance records.
What is "Oh" in the Korean version?
It's the verb ending ~네(요)
Check it here
Oh dear = 저런! = 이런! = 오! = Good lord! = Good gracious! =Huh!
Oh itself can be written as '어머나,'
Or you can just say 오!
(To be more casual, 앗! is also okay in this occasion.)