To travel to Korea for 1 days, is it better to apply for a visa directly at the embassy or to find a travel agency?

If you travel for 1 days, it is estimated that you have to apply for that kind of tourist visa. Since it is not a study visa, you should prepare relevant materials. If it is close to the embassy, you can go directly. However, if it is inconvenient, it is recommended to find a travel agency and apply for a short-term tourist visa, which will not be too expensive.

P.S. Because it's a short-term visa, you have to buy a round-trip ticket for the air ticket, otherwise the airport won't let you out.