Trek Precaliber 20-inch bicycle 7-speed gear

I recently had it inspected at the Mokdong Trek store, and there are no broken parts. Thinking I would use it for a long time, I went to the Trek store in April and replaced the brakes and gears with new ones because they had scratches or scuffs, but new scratches have appeared in the meantime. You will need to go to the Trek store to replace the handlebars. They are dirty. They say it will cost 20,000 won. I respectfully decline any negotiation inquiries. (Please note that if there are negotiation inquiries, I will have no choice but to raise the price.) Direct transaction near Mokdong.