Here's a link to the Chosun-Ilbo English language coverage. Money quote is here: "...Trump then managed to alarm South Koreans with a throwaway promise to end "war games" with South Korea, which he called "very expensive" and "very provocative."
Surprise!
Thats like saying CNN sources are clued to the real powers making these decisions
Other than war merchants many South Koreans esp. the young are weary of 70 years of war games and would welcome deescalation and not feel less safe by advances in diplomacy