Shim Hye Yun

Son Ji Eun is a housewife who works part-time at a mart. She is quiet and sincere, even as she feels trapped in her unhappy life and lonely marriage. One day, she meets biology teacher Yoon Jung Woo and her heart starts beating again. They both know that only ruin will await them, yet they cannot seem to stay away from each other. (Source: xyLaar at MyDramaList)