What do the cast of 'Hey Ghost, Let's Fight' promise to do if they reach their viewership rating goal?

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Kim So Hyun and Taecyeon promised, "If the viewership goes over 5%, then we will wear the same costumes from the drama and enact a fight scene at the exact place we filmed the fight scene." No takes backsies, Kim So Hyun and Taecyeon! We will remember that promise! 

Kwon Yool, on the other hand, said, "We will think very carefully about [what we can do for the viewers] and announce our decision at a later time through [the drama's] official Facebook page." 

Some fans revealed what they personally wanted to see, yelling out, "How about riding roller coasters in ghost costumes??" and, "Free hug event!" 

At the free hug suggestion, Kwon Yool remarked, "If the drama goes over 10%, then Taecyeon will hold a solo free hug event."