It's a bit stupid on his part, but it's to ruin his own reputation, so that his brother can be the clan heir.
Even with his Qi blockage, MC is still a genius, so some people may want to put him in leadership. They will make sure he married and got children to pass down the "genius", and then have the council of elders control through a puppet leader.
MC want his brother to be the clan leader, so that's why he did all those, and plan to live a lazy life till he die. But now that someone actually tried to assassinate him, it's no longer a viable plan.
i see i see thank u Yami for taking the time to answer, i was so confused by jt but now it kinda makes sense (⌒▽⌒)
hmmm I'm at chapter 8 and why was he just so stupid before? like getting drunk and being a terrible brother do they explain why he was like that if he was reincarnated since being a baby? idk that's just so strange and they didn't give a answer to that, idk if this os worth reading.. anyway I'm going to try some more