Thank you for your response. 😀 The one thing that he didn't take a look my Ipad 2 and he didn't know it has an engraving.
I printed the photo to show the light leakage on the screen. I'm wondering why he could say I can replace only once and I cannot return the replacement item after that if I choose this option.
I have 2 choices, replace only once or return it.
Althought I asked him why many people who has the same issue can replace it more than once. Someone replaced it 5 times. He responsed me "it's change policy. For currently you can replace it only once."
It's kind of he doen't want to responsible for it. He knew if he said like this, who dare to replace? He can't guarantee the replacement item is ok. I feel I'm so disappointed with his service. I'll call apple customer service again.