An evening out with colleagues here follows a predictable, alcohol-centered pattern: dinner, usually some grilled pork, washed down with soju, Korea’s national vodkalike drink; then a second round at a beer hall; then whiskey and singing at a “norae bang,” a Korean karaoke club. Exhorted by their bosses to drink, the corporate warriors bond, literally, so that the sight of dark-suited men holding hands, leaning on one another, staggering toward taxis, is part of this city’s nighttime streetscape. The next morning, back at the office, they are ready to fight, with reaffirmed unity, for more markets at home and abroad.

Many professional women manage to avoid much of the drinking by adopting well-known strategies. They slip away while their male colleagues indulge in a second or third round of drinking. They pour the drinks into potted plants. They rely on male colleagues, called “knights in shining armor,” to take their turns in drinking games.

Companies, too, have begun to respond. Since 2005, Posco, the steel manufacturer, has limited company outings to two hours at its mill in South Korea’s southwest. Employees can raise a red card if they do not want to drink or a yellow card if they want to go home early. At Woori Bank, one of South Korea’s largest, an alarm rings at 10 p.m. to encourage workers to stop drinking and go home using public transportation, which stops running before midnight.

“My boss used to be all about, ‘Let’s drink till we die!’ ” said Wi Su-jung, a 31-year-old woman employed at a small shipping company.

Ms. Wi, who was out enjoying the sun in downtown Seoul, said the atmosphere began changing as more women joined her company in the past couple of years. “The women got together and complained about the drinking and the pressure to drink,” she said. “So things changed last year. Now we sometimes go to musicals or movies instead.”