Emergency Couple (ABS-CBN)

While in their early twenties, a medical school student, Oh Chang-min, and a dietitian, Oh Jin-hee, fall in love and marry despite his family's strong opposition.^[5][6] Chang-min comes from a family of wealthy, successful doctors; they think Jin-hee isn't good enough for him, and after he marries her, they cut him off without a cent. In order to earn money right away, Chang-min gives up his dream of becoming a doctor, and instead becomes a pharmaceutical salesman.

 He is miserable at his job, while Jin-hee's inferiority complex deepens as her husband's family continues to look down on her. They begin to fight constantly and eventually get a divorce. Six years later, Chang-min has gone back to med school to pursue his dream, while Jin-hee has also put herself through med school. They end up as interns at the same hospital, where they'll have to work in the emergency room together for three months.
http://en.wikipedia.org/wiki/Emergency_Couple