This manga is one of the favorites.
Summary:
About a boy who wanted revenge because his mother was killed so you train and train until he became strong. No one could compare to the mc power.
Revenge, he almost died because of poison, torture by one man. The man he poison him with a lot of different poison so he wants revenge for his sect and he killed everyone who is involved in killing his sect.
Defeated by a suicide attack in battle and is reborn as a first born child to a local lord. Having a fresh start, a warm family and a little sister to protect - he decides to become a better person in his new life.
Good read
Betrayed by the people in the sect and his father killed himself to save the him and he goes on the path of revenge.
Guy that has many elements and this is literally the definition of weak to strong in my book.
Red Storm