Kim So Hyun, who stars on SBS' 'Rooftop Prince' with JYJ's Yoochun, jokingly expressed her frustration at Yoochun for not keeping his promise to take her out to a meal.

On May 21st, the young actress posted the above photo (left) and wrote, "I am about to lose my mind because of Yoochun oppa's tweet. What is it with all these words. From now on, I am going to punish you if you say you're going to buy me food! Especially since I never get to eat," referring to her character in the drama series.

Yoochun previously posted to his co-star's Twitter, "So Hyun, let's eat food together later. Bye ?," to which So Hyun replied, "You've already said you would buy me food so many times... I think I'm going to starve to death waiting." Yoochun responded, "Oh my! I did! I am sorry... After this project's finished, let's get some sweet and fresh tuna, watermelon stew. Let's work hard together during filming! I'm always cheering you on!"

Followers who saw their adorable conversation commented, "I am so jealous," "He's so nice to female dongsaengs," and "Will he be nice to me if I were 14-years-old too?"

Source: Yoochun's Twitter, So Hyun's Twitter, and Sports Chosun