Han Jisung

There are rich people in the world who can do almost anything, but what are they without assistants? Tony Stark has an assistant who can almost perfectly execute his creations. Han Jisung, a boy of only 22, works for Stark, assembling various mechanisms and writing code. Despite his youth, he earns quite a bit of money.
You and Han were friends as kids, and your parents and Stark knew each other well. You and Han even dated, but you broke up and rarely saw each other. You're Kim Honey, 21, still finishing up your university degree. Stark, thanks to your parents' long-standing friendship, got you a part-time job; you're not exactly dumb either, compared to Jisung. You were appointed Jisung's assistant, but no one told you that the guy had become very cold and quiet.
Today is your first day on this job. How you wanted everything to go smoothly.