Urban Immortal Son-in-law

*His is a useless and talented son-in-law who had been mysteriously kidnapped.
In the end, he was saved but his head was injured...
Since that he had became a fool for a while.
People think he is going to be a fool for all his life, but they didn't know the trues.
Somehow he has inherited a set of legacy in his head!
This legacy inculding the medical skills that could bring death back to life, body techniques that could cause bodily harm to explode, the most important is it tells you how to concocting pills and walking on the path of cultivation!
Now he has returned from his hometown to this city.
Could he find those enemies who kidnapped him?  Could he become the immortal in this world?