The Starting Line
Two days before TransJeju, I woke up at 4:30 in the morning when I was supposed to be sleeping.
I had gone to bed early.
I had a taper plan.
I knew what I needed to do.
Reality did something else.
That morning, I wrote about Flexible Clarity enough clarity to know where I’m going, enough flexibility to respond to what I find, and enough honesty to recognize the difference between adapting and making an excuse.
At the time, it was an idea.
At kilometer 50 of TransJeju, it became a decision.
My legs were beginning to tense. I was approaching the edge of cramping. My stomach had already turned against me. I could still move, but I was no longer moving freely.
There were runners ahead of me.
There were positions I could chase.
There was also a marathon waiting for me in two weeks and UTNP 9 Peaks two weeks after that.
The question was no longer whether I could push harder.
The question was what pushing harder would actually accomplish.
The Path: The October Crucible
October contains three races:
October 3: TransJeju 60K(Flow)
October 17: Gyeongju Marathon(Precision)
October 30: UTNP 9 Peaks 122K(Grit)
Three races.
One body.
I cannot treat them as independent events.
Whatever I spent at TransJeju would follow me to Gyeongju. Whatever I spend at Gyeongju will follow me into the mountains at 9 Peaks.
That made the TransJeju objective complicated.
I wanted to finish as quickly as possible.
I also wanted to avoid creating unnecessary muscular damage.
Those goals are not complete opposites. Running efficiently can sometimes be less damaging than spending additional hours walking with deteriorating mechanics, poor fueling and growing fatigue.
But speed is only efficient while the body can support it.
Once mechanics begin breaking down, faster stops being free.
The plan was to find the edge, stay near it and avoid crossing it merely because my ego wanted a better number.
The First 20 Kilometers
The official tracker recorded my start at 8:01 a.m.
I reached Meochewat Forest Trail at 19.6 kilometers in 1:57:19, ranked 113th.
The first section felt good.
My breathing was controlled. My feet and ankles felt stable. The terrain changed, but I felt capable of responding to it.
This was important because technical confidence has not always been one of my strengths. On this day, I watched other runners hesitate or struggle for footing while I felt unusually comfortable.
For a while, I was in the zone.
Not forcing speed.
Not fighting the terrain.
Just moving.
I reached Eseungak Oreum at 29.9 kilometers in 3:11:59.
Still 113th.
Thirty kilometers into the race, my position had barely changed.
The plan appeared to be working.
The Turn
I reached the camping site at 40.9 kilometers in 5:12:14, ranked 112th.
That was my highest position of the day.
It was also approximately where the race began changing.
Somewhere around 30 to 40 kilometers, I ate gukbap at a checkpoint. I cannot say whether that caused the problem. It could have been the food, the accumulated gels, the intensity, or simply several hours of running.
But my stomach began to feel sick.
I did not want to eat anymore.
That created a predictable chain:
Nausea reduced my fueling.
Reduced fueling lowered my muscular output.
Fatigue made my feet and legs feel heavier.
Heavier mechanics made every kilometer more expensive.
My cardiovascular system was not the main problem. I was never gasping for breath. I still had an engine.
The problem was that the rest of the vehicle was becoming harder to control.
On the descents, I tried to use short, quick steps rather than reaching forward and pounding my knees. That was an improvement over previous ultras, when I sometimes allowed gravity to pull me into long, damaging strides.
But I may have gone too far in the other direction.
At times, I was almost squatting down the hill, keeping constant tension in my legs. That reduced impact, but it also placed a continuous eccentric load on my quads.
Protection has a cost when it becomes tension.
Healing Forest
I reached Healing Forest at 50.4 kilometers in 6:51:25.
My position had fallen from 112th to 124th.
That was not a collapse. It was a signal.
My body was becoming less capable of supporting the pace I had maintained earlier.
During the final section, my muscles began tensing and approaching cramps. Somewhere in the woods, medics or race staff sprayed 파스 on my legs. The cooling sensation helped temporarily, but it did not solve the underlying problem.
My legs were tired.
My fueling had deteriorated.
My mechanics were becoming less automatic.
This was the moment when the ideas from September became real.
Before the race, I had written:
The edge is the highest level of effort I can sustain without crossing into waste.
At Healing Forest, I had to decide whether chasing the runners ahead of me would serve the larger objective or simply satisfy my ego.
Could I push harder?
Probably.
Would pushing harder necessarily produce a faster finish?
I do not know.
It might have gained a few positions. It might have caused stronger cramps, worse nausea or a slower final section.
I chose not to find out.
Nobody Cares About the Top 100
During the final 20 kilometers, I thought about finishing in the top 100.
Then I thought:
Who cares?
That is not an insult to the people who finished there. They earned their positions.
It was a question directed at myself.
What would 99th place meaningfully change?
Would it make the experience more valuable?
Would it make me a different athlete?
Would anyone remember the difference except me?
And what would I be willing to spend for that number?
Most of us eventually encounter a moment when additional effort stops serving the objective and starts serving the ego.
It might happen during a race.
It might happen while building a business, accepting another project, continuing an argument or working through exhaustion because rest feels like weakness.
From the inside, commitment and waste can feel almost identical.
Both tell us to keep going.
The difference is what the effort serves.
I had not come to TransJeju to protect a ranking.
I had come to move efficiently, experience the course and leave myself capable of continuing through October.
The ranking was information.
It was not the objective.
The Finish Line
I reached Jeju World Cup Stadium at 4:29 p.m.
62 kilometers.
1,407 meters of elevation gain.
8:28:08.
145th place.
I had lost another 21 positions after Healing Forest.
I also crossed the finish line healthy.
That does not mean I finished fresh.
I could not run completely normally at the end. My legs were heavy. My body had absorbed more damage than I initially wanted to admit.
Controlled does not mean easy.
Restraint reduced the cost. It did not eliminate it.
This matters because it would be easy to rewrite the race into a cleaner story:
I held back. I protected myself. Everything went according to plan.
That is not completely true.
The first half may have been slightly too aggressive. My fueling plan did not survive nausea. My downhill mechanics still became expensive. I approached cramping during the final section.
But the plan was never supposed to predict everything.
The plan was supposed to help me make better decisions when reality arrived.
That is what Flexible Clarity looked like at TransJeju.
The direction remained the same.
The next step changed.
Nine Years Later
My first trail race was TransJeju in 2017.
I chose the 50K without really understanding what I was signing up for. I had run a marathon, but running faster did not interest me very much. I wanted to know whether I could go farther and move across different terrain.
During that race, I discovered what a GPX watch was.
I saw people wearing trail-running vests.
I did not have the equipment, knowledge or data I have now.
I mostly had a “just do it” mentality.
That mentality helped.
Nine years later, I returned with the vest, the watch, the fueling calculations, the course profile and enough planning to turn a simple race into a minor research project.
I am a more capable athlete now.
I am also capable of making the process much more complicated.
Maybe progress is not replacing instinct with information.
Maybe it is learning how to use information without allowing it to drown out instinct.
In 2017, I did not know enough to overthink the race.
In 2026, the challenge was knowing enough and still remaining present.
The terrain changed.
The people changed.
The race grew from something that felt small and unknown into an event with approximately 1,500 runners.
But some parts remained simple.
Move forward.
Pay attention.
Respond to what is in front of me.
Listen when someone says “파이팅.”
Take the next step.
Phase One Complete
TransJeju was not the final examination.
It was the first test.
It showed me that I can move efficiently across runnable trail terrain for several hours.
It showed me that my technical confidence is improving.
It showed me that my ankles and feet can be strengths rather than constant concerns.
It also confirmed that downhill durability, late-race fueling and fatigue-resistant mechanics remain my largest problems.
Those problems will matter much more at 9 Peaks.
First, however, comes Gyeongju.
The next challenge is completely different.
At TransJeju, the terrain changed constantly and adaptation was unavoidable.
At Gyeongju, the road will be mostly smooth. The pace will be specific. The temptation will be to let a few fast kilometers convince me that I am stronger than the plan.
The task will not be surviving uncertainty.
It will be maintaining focus.
Finding the edge.
Staying there.
Not crossing it because the opening kilometers feel easy.
Not retreating because the final kilometers become uncomfortable.
TransJeju asked me to adapt.
Gyeongju will ask me to hold.
Then 9 Peaks will ask me to endure.
Phase One is complete.
The recovery is now part of Phase Two.
One body.
Two races remaining.
The October Crucible continues.
