Yong Jun Hyung seemingly spent at least part, if not all, of his White Day not with his girlfriend, Kara′s Goo Hara, but with his Monstar co-star Ha Yeon Soo.

The producers of the Mnet drama released on March 14 photos showing the two leads sharing chocolates with the staff.

The two posed together in one photo, smiling at the camera in school uniform.

A rep from the drama said, "Yong Jun Hyung and Ha Yeon Soo have been showing some natural acting despite the roles being their first acting roles ever. They′ve been bringing enthusiasm to the set with their passion."

Monstar is about how teenagers are healed through music.

Photo credit: Mnet