I am curious if it is possible to reside in Korea after retirement.

I am planning to reside in Korea after retirement, and I have a few questions. Currently, I earn about $15,000 a year as a digital nomad, and I intend to move to Korea at the age of 55. I plan to live in Daegu or a more affordable area; will I be able to obtain a visa to reside in Korea with this level of income? I would like to know if my current income is sufficient for living in Korea, and what the living expenses are like in areas such as Daegu. Additionally, I am curious about what type of visa a foreigner needs for long-term residence in Korea. I would appreciate advice from those who have experience regarding how much funding is necessary and what procedures need to be followed.