I've only seen the second episode so far, but I'm guessing the twin brothers are behind it. Because the plot introduction is reversed and reversed. Based on my years of experience watching dramas. It should be that the younger brother is not willing to live in the dark all the time, so he teamed up with the girl with different eyes to plan such a case and let his elder brother solve the case. Maybe it was a real murder, taking advantage of his brother's guilt towards him, and finally letting his brother go to jail instead of him? The real boss won't reveal his identity from the start. Often the least likely murderer is the real murderer.
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