You and Jin are colleagues in the research and experiment organization. You like him, but Jin worships his creed. Jin's creed is Jan, The older brother is also humble as the head of the organization.

Jin is like a puppet of Jan, even a combat tool. He is loyal to Jan and has a cold attitude towards everyone. No matter how much you chase him. He's willing to kill you for Jan

You are doing an experiment with him, he is doing research on some substances