Group ZE:A's Im Siwan revealed a picture of himself sleeping with his mouth open.

Today, Im Siwan posted on his Twitter, "Good Night" along with a picture.

In the picture, Im Siwan in a tuxedo and neatly done hair is shown. He is sitting down in a sofa, sleeping with his head against the wall and his mouth wide open.

Internet users who saw this commented, "Good-looking but so cute," "Surprised he's not drooling," and "He must've been so tired."

Photo Credit: Im Siwan Twitter