'School 2013's Lee Jong Suk and Kim Woo Bin revealed their surprising drinking habits.

On the March 23rd broadcast of KBS 2TV's 'Entertainment Relay', the two actors were spotted at the set of their 'Cass' beer CF and revealed their love for drinking.

When asked about their drinking habits, Lee Jong Suk shared, "I fall asleep." Kim Woo Bin who is know to be a close friend of Lee Jong Suk teased his co-star adding, "He sleeps with his mouth open." Kim Woo Bin also shared his own drinking habit revealing, "I sleep with my eyes open."

They both also show off adorable aegyo, much to the delight of viewers.

In other news, the two will be appearing, along with their other cast mates, in the upcoming episode of 'Running Man'.