Jo In Sung, Gong Hyo Jin, Lee Kwang Soo, and EXO's D.O. gave fans more reasons to watch 'It's Okay, That's Love' with their mysterious expressions in still cuts recently released from their first filming!

SEE ALSO: Jo In Sung, Gong Hyo Jin, Lee Kwang Soo, EXO's D.O., & more attend first script reading for 'It's Okay, That's Love'

The cast entered their first filming at a townhouse in Bundang earlier this month, and showed their professionalism by monitoring their scenes and consulting with the director on their characters. Due to their popularity, fans also flooded the set, putting the filming on hold at one point.

The romantic mental clinic drama is the work of writer Noh Hee Kyung and director Kim Kyu Tae, the same team that created the masterpiece that was 'Wind Blows in Winter', and it will premiere following 'You're Surrounded' this July!