Yoo Jae Suk has gone viral with his latest hilarious mistake. 

On the latest episode of MBC's 'Hangout With Yoo,' Yoo Jae Suk took on the challenge of helping the owner of a struggling business sell items on the street. He was able to sell to a variety of passersby, including a woman heading back from a job interview and a father of an elementary school student.

However, trouble occurred when a woman and man came by together. Yoo Jae Suk greeted the two politely, then asked the woman, "Is this your son?" With a shocked and embarrassed expression, she laughed and said, "What? It's my boyfriend..."

Co-host HaHa then knocked Yoo Jae Suk to the ground playfully, pretending to punch him and asking, "Are you crazy?"

Yoo Jae Suk deeply apologized to the woman and her boyfriend, while mentioning, "No, but it really looks like he's in school..." referring to the man's youthful outfit. Yoo Jae Suk went on to apologize further, saying, "I'm sorry. Anyone can tell that you two are a couple. You look great together." He then took pictures with the couple.

You can watch the full clip of Yoo Jae Suk's comedic mistake here, starting at timestamp 9:33:

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