Responses
Coming from the novel of this webtoon, It is because they want to know if the person giving them money is giving it tobthem because of a job, or like some type of donation. This way, they can trap the other person as well, and use them as blackmail to get more money from the main guy
love how loan sharks are always so invested in their indebters lives hahah like they are paying to who care where the money comes from