Ability Stealing Hunter

Many years back, the secret portal of another world began to appear on the earth, and human beings have gained an additional occupation: hunter. Although the upper limit of the level that everyone can achieve is different due to differences in talent, but compared to most ordinary occupations on earth, the income of hunter is objectively more. Especially the income of high-level hunter gets higher. It is very enviable, thus more and more people began to join the team of hunter. But the main protagonist is the unluckiest hunter in history!