New web drama 'Sound of Heart' finally revealed its poster with all the main characters, drawing a lot of attention. Lee Kwang Soo is showing off his comedic facial expression in the center of the poster! 

The production company released the poster on October 10 for KBS's first web drama, titled 'Sound of Heart,' which is based on a webtoon that has been popular for the last 10 years. 

SEE ALSO: Lee Kwang Soo returns to SBS entertainment program for the first time in two years

The poster shows off individual actor's funny facial expressions that definitely match each original cartoon character.

Can't wait to see Lee Kwang Soo in action!