What do "Karrot Market," "Bungaejangter," and "Jungonara'" have in common? These are all Secondhand Trading Market Platforms that make it easy for people to make secondhand deals. The secondhand trading market platform in Korea has steadily grown, overtaking some shopping apps such as "11Street." According to a survey conducted by Wiseapp/Wiseretail, a professional data analysis company, as of January 2021, the number of users of the secondhand trading app "Karrot Market" was recorded at 10.94 million, increasing 158% from 5.14 million users in January 2020. However, in line with this growth, problems related to secondhand deals also increased. As a result, to make secondhand deals safer, institutional improvements are needed to prevent increasing secondhand deal fraud and eliminate secondary damage.

First, the existing system is insufficient to prevent new fraudulent measures. According to the big data platform "The Cheat," the number of cases of secondhand deal fraud in 2020 was about 245,000. It is about 2.8 times that of about 90,000 cases in 2015. In 2015, a safe payment system was introduced to prevent secondhand trading fraud, but recently, new fraudulent measures that exploited the safety payments have been on the rise. According to the Joint Response Cafe for Safety Payment Fraud, the damage from online safety payment fraud increased by about 25.1 billion won from December 2019 to early September 2020. Besides, in Karrot Market apps, people can only trade in limited areas, in their backyard. The new frauds are ones where the swindler steals accounts using methods providing a "substitute certificate" to deal in other regions. Currently, only Karrot Market provides warning notifications for substitute certification frauds. Second, the current system cannot prevent secondary damage to secondhand trading fraud. Under laws related to financing, such as the "SPECIAL ACT ON THE PREVENTION OF LOSS CAUSED BY TELECOMMUNICATIONS-BASED FINANCIAL FRAUD AND REFUND FOR LOSS," accounts used for secondhand trading fraud cannot stop payment. It is because secondhand trading fraud is not covered under clause 2 (2) of that law. It raised the possibility that the same account could continue to be used for fraud. For instance, the "three persons fraud" is a secondary damage that occurs after secondhand trading. In this case, the swindler identifies the accounts and personal information of the seller. Then the swindler scam with the account of the seller(victim). However, it is difficult for the victim to know if the swindler uses the account for fraud once. Besides, according to lawyer Noh Yoon-ho, there are possibilities of committing a secondary crime using the face, address, and personal information of victims.

In 2021, secondhand trading app users exceeded 10 million, and the types of used trading items such as books, electronic devices are becoming more and more diverse. Secondhand deals have the advantage that people can purchase necessary goods and sell unnecessary goods with ease. However, not only the advantages of secondhand trading but also the problem of fraud continues. Therefore, the secondhand trading market platforms have to actively intervene to prevent damage for the sustainable growth of the secondhand trading market. The system needs to be improved and to follow-up with scams. It could reduce secondhand trading damage. Therefore, I hope that the phrase "Happy Jungonara (the name of Secondhand trading platform) Today" will no longer be perceived as a paradox.