Initially the MC murdered the person who raped his little sister and caused her to kill herself
He is sent to prison for 7 years and once he's out he decides that he wants to kill himself, as he feels like he is to be blamed for the demise of this sister
Right before he takes the step to kill himself, he sees a girl praying at his little sister's grave.
*skip to last paragraph for no spoilers*
He then realises that this girl was actually the daughter of the rapist he murdered, and he is also going to be adopted into his family, so initially the daughter of the person who he murdered, becomes his sister
In the latest chapter he writes a suicide note and tries killing himself, but is stopped by this girl
Overall it's been pretty good and interesting. A lot of mysterious yet to be solved, and a weird dynamic between the mc and the girl.
It is very dark tho, so avoid it if you don't enjoy that type of stuff
