maybe the real son bullied the adopted son so while protecting himself the adopted one killed the real one and the father wants a revenge now . et he is a jerk the adopted son .
i'm thinking it was the real son who was bullied, b/c he really didn't want to go to school (he played sick)
hmmm maybe well let the suspense be cutted by the manga itself
maybe the real son bullied the adopted son so while protecting himself the adopted one killed the real one and the father wants a revenge now .
et he is a jerk the adopted son .