SEE ALSO: YoonA monitors herself on the set of 'Prime Minister and I'

Viewers witnessed YoonA's transformation from a reporter to a prime minister's wife, and now it was Lee Bum Soo's turn to dig deep into his soft spot for YoonA, which we all know he has. After all, that's how he earned the nickname "hedgehog husband." However, things get more complicated when Yoon Si Yoon also warms up to YoonA.

YoonA and Yoon Si Yoon filmed their romantic rain scene at Goyang Cultural Center on January 4, when the couple acted out their suppressed feelings for each other perfectly with no NGs, pulling through the heavy rain made from a sprinkler truck in cold weather for two hours straight.

A rep commented, "Lee Bum Soo is portraying the 'hedgehog husband,' who is rough on the outside but warm on the inside when it comes to YoonA... Like Lee Bum Soo's cold and warm charms, the viewers are also warming up to the drama with interest, so we are thankful."