If you’re an avid watcher of 18 Again, you might remember this comic yet sweet scene where Aerin (played by Lee Mi Do) slips dramatically in the lobby. Of course, she is saved by our hero, Wooyoung (played by Lee Do Hyun).

In a behind-the-scenes clip, Lee Do Hyun hilariously revealed a trade secret of the drama industry!

First, a look at how dramas film falling scenes! The actor is propped up on a chair for close-ups.

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When the director noticed that just one thing was lacking, he decided to take it into his own hands. Lee Do Hyun lacked the quintessential, heart-fluttering veins running down a guy’s arm.

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The staff started gathering to help. In order to create veins in the hand, one has to block off circulation in the arm.

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The finally created it through the use of a rubber band on his upper arm. Once the veins were created, Lee Do Hyun proudly showed them off to the camera, declaring he was a manly man!

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Even right before the scene was shot, he kept pumping his fist to make the veins more obvious.

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The final result was a great close-up shot, including his ahem, manly veins.

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The difference is quite stark, with and without the extra help!

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Catch the adorable behind-the-scenes clip below! You can tune in to 18 Again every Monday and Tuesday at 9.30pm KST.