'Superstar K4' heartthrobs�Roy Kim and Jung Joon Young put aside their boy-next-door image for a more rugged look in '1st Look' magazine's January issue.

The photos show Roy Kim and Jung Joon Young perfectly pulling off the 'bad boy' concept through their charismatic facial expressions, chic sunglasses, and wonderfully�tousled hairstyles.

During an interview for the pictorial, Jung Joon Young revealed his hobbies and shared, "I love going to the PC room, having fun drinking, watching movies, and working out. Unexpectedly, I also like to read books." Roy Kim seems to prefer different interests as he stated, "Rather than playing around by jumping around crazily, I like to go to the sauna after I eat and sit in a cafe."

The talented singers also revealed their ideal types. Roy Kim shared, "I like a woman who is pretty without being high maintenance and has pretty eyes." Jung Joon Young stated, "Of course, she has to be pretty and sexy. She has to have charm."

Check out the pictorial below!

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