Actor Sung Dong Il's son Sung Joon revealed that he's biased when it comes to his two younger sisters.

On the April 10th broadcast of SBS' 'Good Morning', Sung Dong Il, his wife, and three children left on a trip to Boracay in the Philippines. When Sung Joon was asked how he felt about going on a trip he said, "I'm really happy."

The adorable youngster was then asked if there was anyone he didn't want to go on vacataion with, and Sung Joon answered, "Sung Bin," the older of his two younger sisters. He explained, "Bin does not listen to what I say and fools around too much. Yuri (youngest sister) is cute, but Bin is ugly."

Sung Dong Il said, "Joon has a friend who has a sibling that is close in age to Bin. That friend really likes Bin. That friend once asked Joon, 'Do you want to trade sisters?' to which Joon replied, 'I don't want any of them, so you can take have them both,' but he also said that his friend cannot take Yul."

Sung Dong Il and his son Sung Joon currently appear together on MBC's 'Dad! Where Are You Going?'