Despite the intensity and gravity of�SBS' action thriller 'Three Days', the cast found themselves all smiles in behind-the-scenes pictures, creating a fun and enjoyable atmosphere amidst some tough days of filming. �

Although dressed as a hospital patient with a head wound, So Yi Hyun smiles brightly once she's out of character. �Even Lee Jae Yong, who plays the serious special prosecutor, shows off some unexpected�aegyo in two separate photos.

SEE ALSO: Another K-drama faces record-low viewer ratings in the 0% range

The production company Golden Thumb Pictures said, "'Three Days' may not be a drama in which the romance stands out, but the actors create a sweet atmosphere on set with their sentimental expressions and amicable vibes. �In addition, when the actors are engaged in their filming, they radiate with more devotion and fighting spirit than anybody else to the point they show a 180-degree difference in personas."

How are you liking the drama so far?