Regarding tax on trading in share

Hello, suppose one person earning 10 lakh in a year and paying their income tax as per tax slabs and supoose person start trading and earn 500000 lakh in a year as a ptofit then how tax calculation will be done.

Is 1500000 lakh count as a income and and tax accordingly

Or

We should to pay 15% of 500000 lakh as tax for trading and for 10 lakh as per income tax slab