The abstract for an essay in the latest Korea Journal titled "Stigma, Lifestyle, and Self in Later Life: The Meaning and Paradox of Older Men’s Hang-Out Culture at Jongmyo Park" by Chung Gene-Woong can be found here (hat tip to Mark).
The abstract makes no mention of the nearby bars where "men's hang-out culture" takes place, and certainly makes no mention this aspect of later life.
Fun tidbit: This photo reveals that there were still lots of houses in front of Jongmyo in 1945, though a small open area can be seen. It's likely the result of a fire break built (or demolished, really) by the Japanese in preparation for US firebombing during World War II.
More on aerial photos, and a list (and a photo) of the fire breaks can be found here. I don't know when the park in front of Jongmyo was built, but it may be a part of the legacy of the fire breaks, much like the Seun Sangga.