A protagonist without emotions in an isekai. Creator of their own syst

What is this book about? The story revolves around a man named Seik, who lives trapped in the monotony of a society where people are absorbed in their phones, and life repeats itself meaninglessly. Lacking emotions, Seik searches for meaning in life. As he waits for the bus, he realizes that he is not the only one who lacks something, as life and the environment he finds himself in are not truly alive. Seik dies inside that bus. It is not known what killed him or who was responsible, but to Seik, that entity is more human than humans themselves. Seik is reincarnated in another world. The most ironic thing of all is that he is reborn into a family of murderers. What is Seik like? Seik is a strategic and analytical character. He is not your typical cliché protagonist. Lacking emotions, he is cold, methodical, and always hides his true plans. In his past life, he was a psychologist, and in his new life, he will use that knowledge when the time comes. Will there be romance? Are you wondering if there will be a harem? The answer is... I don’t know yet. Seik literally lacks emotions. But don’t worry—he’s not a flat character; Seik has an almost ironic tone, and in time, we’ll see how he’ll fare in romance... or if there will be a harem. Will he have a system? Yes, later on, Seik will have his own system. It will be a mutual shaping: He will create it, and the system will shape him in return. What about the world? In the world where Seik is reincarnated, there are monsters, dungeons, and kingdoms. But to Seik, this new world is not so different from the old one. Who are the real monsters? Are they the humans... or the creatures labeled as monsters simply for being what they are?