If you've ever wondered what celebs do with their free time or what they'd be doing if they didn't have a career in show biz, this might give you an idea. Here are some celebs who have unique certifications!

The actor wasn't the face of coffee CFs for no reason. An avid coffee drinker himself, the Hallyu actor took a barista course and became certified after filming his movie "I Saw the Devil." He makes himself coffee each morning and even carries around his own portable coffee tumbler.

The actor has a boat operator's license! He actually snagged it for season 3 of "Three Meals a Day." He passed the written and driving test in one try! Another unique fun fact about the actor: he actually majored in business administration at New York University and was even a general manager of an asset management company!

The actress snagged a scuba diving license to overcome her phobia of water. It was advice from her friend and actress Lee Honey, who is an avid scuba diver herself.

Probably the most unexpected- the idol star has an excavator operator license! The Girl's Day member got the license back in 2014 for the show "Ecovillage" where she participated in building a home. But the biggest irony here is that while she can maneuver a forklift, she failed her regular driver's license test.

The former announcer and actress has a master scuba diving license, and she was the first female celebrity to get the certification in South Korea. Just to give you an idea of how extraordinary this is, this means she is also a certified rescue diver, and that she earned five specialty diver certifications and have logged at least 50 dives.

The gag-woman has not one but three certifications! Onami majored in the Department of Social and Physical Education in college and earned a lifesaver certificate. She also has a hairdresser's license -- she worked part-time in beauty salons before her debut. Finally, the strangest of all, she has a seed license! She boasted her expertise on one show, where she guessed eight out of ten seeds correctly.

The broadcaster has a bakery license! The announcer apparently always had a dream of setting up a bakery.

The actress got a sexual education certification because she said she wanted to gain more personal knowledge. The actress, who said she wants to have many kids, also said she wanted to prep to teach her future children. What's more, she has a total of eight unique certifications, including one for origami, balloon art, and more.

The actor is certified to teach English and German!

She has a vegetable sommelier license! This means she is an expert on the health benefits or fruits and vegetables.

Turns out this actor quit law school in six weeks in order to pursue his dreams of acting. Contrary to the clumsy image of his roles on the screen, like in "Drinking Solo," the actor is incredibly bright -- he's even placed first in his school ranking. The actor, who had also once dreamed of going to medical school, has a nursing assistant certification! As a result, he even served as a medic during his military service in the Korean Army.

Psy bragged that he had a "platinum" soju & beer license, given to him by the alcohol company Hite-Jinro. But it turned out to be nothing official!