All is still not well at Samsung's mobile business. Its top marketer at the Seoul headquarters is exiting, less than two months after taking the role at the Korean conglomerate -- and one month before the launch of the company's next flagship device.

In December, Kim Seok-pil filled the chief marketing role, replacing D.J. Lee, whose departure was seen as penance for ailing smartphone and tablet profits. On Tuesday, Mr. Kim resigned due to health issues, according to multiple reports. He will be replaced by Lee Sang-chul, another company veteran currently leading Samsung's operations in Russia. The Wall Street Journal first reported the news.

Mobile sales at Samsung continue to slide, as it faces pressure from Apple and a slew of ascending Chinese brands. Last week, Samsung reported a 64% annual decline in operating profit for its mobile division. Other business units, such as semicondutors and home appliances, are on the upswing.

Samsung recently sent out invitation for an event on March 1, at the Mobile World Congress in Barcelona, where it is expected to unveil its latest Galaxy smartphone.