The day everyone in Korea wants to move
If you have rented an apartment in Korea, you may have found that moving companies are fully booked on some days and quiet on others, with prices to match. The pattern is not random. It follows son eomneun nal (손없는 날), literally "days without son."
Son (損) is written with the character for loss. In folk belief it refers to spirits that travel between compass directions and interfere with human affairs. Traditionally, these spirits were understood to move on a schedule tied to the lunar calendar.
| Lunar date (last digit) | Direction occupied |
|---|---|
| 1, 2 | East |
| 3, 4 | West |
| 5, 6 | South |
| 7, 8 | North |
| 9, 0 | Sky — none on the ground |
So the days when the lunar date ends in 9 or 0 — the 9th, 10th, 19th, 20th, 29th and 30th of each lunar month — are considered free of interference. Six days a month, on a fixed rule.
Working it out yourself
- Find the lunar date. Most Korean calendar apps display it alongside the solar date, and Korean phone calendars usually show it by default.
- Pick the days whose lunar date ends in 9 or 0.
- Note that some lunar months are short and end on the 29th, so there is no 30th that month.
Because the solar-to-lunar correspondence shifts every year, any list of specific dates has to be checked against that year's calendar. The rule itself never changes, so you can work out any year on your own.
What this does to prices
Here is the practical consequence. There are only six such days a month, and a large share of the country wants all of them. Moving costs rise and preferred time slots disappear, especially when one falls on a weekend.
The inverse is also true: ordinary weekdays are cheaper and easier to book. If you do not hold the belief, that is the rational choice. If you do — or if your family does — book early.
A common compromise among younger households: if older relatives are invested in the date, use son eomneun nal; if the decision is only yours, take the day that works. Choosing dates has always been partly about keeping relationships smooth.
There is practical wisdom buried in it
Traditional date selection was not purely superstition. Much of it encoded scheduling sense.
- Farming seasons were avoided, because no one was available to help.
- Monsoon and deep winter were avoided, because belongings get damaged and people get hurt.
- The days around major holidays were avoided, because labor and transport seize up.
Translated to now:
- Late June through July is monsoon season in Korea; moving then risks water damage.
- Month-end and quarter-end concentrate lease turnovers, which pushes rates up.
- Fridays and Saturdays cost more than midweek days.
A practical order of operations
Independent of belief, fixing the sequence makes the decision easier.
- Establish the window your lease allows. This is the hardest constraint.
- Within it, identify the cheaper days and weeks.
- If a son eomneun nal falls among the remaining candidates, prioritize it.
- If not, take the day that leaves you the most preparation time.
The key is not to swap steps 3 and 4. Fix the auspicious day first and everything else — cost, schedule, availability — gets dragged along behind it.
What choosing a good day actually does
The real value of date selection is that it forces you to work backwards. Once a date exists, you start counting back through what has to happen before it, and the preparation gets more thorough as a result.
The one failure mode to avoid is waiting so long for the right day that the opportunity closes. Choosing a good day and postponing until one arrives are not the same thing.