Crush And Blush (2008)

Cast
Kong Hyo-jin (공효진) as Yang Mi-sook (양미숙)
Lee Jong-hyuk (이종혁) as Seo Jong-cheol, teacher Seo (서종철, 서 선생)
Seo Woo (서우) as Seo Jong-hee, teacher seo's daugher (서 선생의 딸, 서종희)
Hwang Woo-seul-hye (황우슬혜) as Lee Yoo-ri (이유리)
Bang Eun-jin (방은진) as Seong Eun-gyo, teacher Seo's senior's wife (서 선생의 연상 처, 성은교)
Bae Seong-woo (배성우) as Dermatologist (피부과 의사)

Trailer

Synopsis
29 year-old Me-sook is the most unpopular teacher at school. She used to be a Russian language teacher at a high school, but was relegated to middle school to teach English which she can't even understand. She also has a chronic blushing problem, often afraid to even lift her face up. But to top it off, she is in love with another married teacher, Mr Seo, and believes that he feels the same but is just too shy to show his feelings.