SeungJMin Unfortunately, the problem is not clear from this screenshot alone, so it would be better if you could provide us with a minimal project that can reproduce the problem, as Spinebot has already responded. Could you please send it to us?: contact@esotericsoftware.com
Please include the URL of this forum thread in the email so we know the context. Then we can take a look at what's wrong.
By the way, you are welcome to write your questions in your native language, as this forum has a translate button available.