A new interactive billboard in South Korea is as powerful as it is ingenious. The ad features two silhouettes: one is an adult man holding a raised bottle who looks like he's about to attack the other smaller silhouette of a cowering child. 

The brilliance of the ad lies in the fact there's a large space between the man and the child, which is where you come in. The billboard encourages onlookers to step in and stop the man from hitting the child. And once you step in between them, your image is projected on the larger screen, appearing as if you are saving the day. 

A superhero logo then pops up with the words, "Report to become a hero for children." The text at the top of the billboard reads, "Child abuse, you can prevent it." I can't think of a better way to encourage people to become involved in the fight against child abuse. 

What happens when a woman who can’t lie becomes a news reporter? Find out in Park Shin Hye’s new series Pinocchio: