 If you liked
Kuang Shen
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 ...then you might like
Doupo Cangqiong
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(This series is more commonly referred to as Dou Po Cang Qiong or Battle Through the Heavens)
Both are Manhua
Both Main Characters are Overpowered (OP) and wish to revenge family members/their clan
They both have "classes." For example, assassin, magician etc.
Both Main characters train not only their physical strength, but their mental and "qi" (some may refer to qi as magic) as well.