With a little less than a month to go, KBS’ upcoming drama Nice Guy released more photo stills of its gorgeous cast.

This time, the main lead, Song Joong Ki, posed with his drama sister, Lee Yu Bi. Thanks to their round eyes and snow white skin, the two looked like they were real siblings.

In the drama, Song Joong Ki transforms into a bad guy after his girlfriend betrays his heart. While he begins using another girl to get revenge, Song Joong Ki continues to be a sweet and kind older brother to his young sister. Likewise, Lee Yu Bi plays the younger sister who only looks up to her older brother.

Written by the same writer as I’m Sorry I Love You, Nice Guy will star Song Joong Ki, Moon Chae Won, and Park Si Won. It will air in September after the conclusion of Bridal Mask.

Photo Credit: KBS