The summary is:
A nine-year-old boy named Hajun goes on a 55 km journey by himself to deliver a lunch box to his dad, who is a TV host at EBS. He takes the subway, the bus, and visits various stores along the way. He meets different people, faces some challenges, and learns new things. His mom secretly follows him to make sure he is safe, but he doesn't know. His dad is surprised and touched by his son's gesture, but also amused by his wife's trailing. The whole trip is filmed as a fun episode for the show.
Here are the key facts from the text:
1. Hajun is a 9-year-old boy who is on a mission to deliver a lunchbox to his father.
2. He is traveling alone using public transportation, which includes subways and buses.
3. The distance between his starting point and his father's workplace is approximately 55km.
4. Hajun's mother, Yumi, is secretly following him to ensure his safety.
5. Hajun has never traveled alone before and is not familiar with using public transportation.
6. He has a transportation card with a balance of 30,000 KRW.
7. Hajun is carrying a lunchbox, a public transportation card, and 30,000 KRW in cash.
8. He stops at a convenience store to buy a Pokémon sticker and spends 1,800 KRW.
9. He gets on the wrong train at Jongno 3-ga station and heads in the opposite direction.
10. Yumi follows him onto the train, but they are separated by a single train car.
11. Hajun meets an Indian couple on the train who admire his cube-solving skills.
12. He gets off the train at Juyeop Station and transfers to a bus headed towards EBS station.
13. Hajun finds a lost wallet and returns it to its owner.
14. He gets on the wrong bus and heads in the opposite direction, but gets off and boards the correct bus.
15. Hajun arrives at EBS station and meets his father, SungKyu, who is surprised to see him.
16. SungKyu is touched by Hajun's efforts to bring him lunch and thanks Yumi for her support.
17. The journey takes approximately 3 hours and 59 minutes.
18. Hajun travels a total distance of 55km using public transportation.
19. He visits four stores during his journey.
20. Hajun's mother, Yumi, is relieved and proud of her son's accomplishment.