Devil S01 E09 I am the real perpetrator. The tragedy of a man who knew too much

Ryō Naruse, who is an able attorney that can turn any case in his clients' favor, takes cases for the disadvantaged and defends them free of charge; therefore, he is called an "angel attorney." However, it is only superficial. His true self is that of a man who has sacrificed all his life to track down the murderer that killed his dearest younger brother 11 years ago—that is, he is "a cold-blooded revenge seeker, or the Devil King."