As an Israeli agent, Oia’s job is to hunt down the former Nazis by various means. His wife committed suicide and left a note saying "You destroy everything close to you". Oia is extremely guilty of his wife’s death, but the task is still going on. He wants to kill an elderly Nazi. The grandson of the target person, Esser, came to Israel to meet his sister, which provided Oia with a perfect opportunity. He approached Arthur as a tour guide and took him on a tour of Jerusalem. Along the way, Arthur completely trusted Oia and even had same-sex love. However, Oia couldn't get out of the haze of his wife's suicide and learned that Arthur's grandfather had passed away. All this makes Oia feel tired.
When Arthur left Israel, Oia began to miss this ambiguous and friendship mixed feeling. He flew to Germany to find Arthur, but accidentally learned a secret, which left him greatly confused and did not know how to choose
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