I was told that I can't withdraw without paying taxes

With the introduction of an acquaintance, I opened an account at Bulutun Wealth and started trading from a small amount. I made a good profit and achieved the target profit, so when I tried to withdraw, the investment adviser of the other party said, "You can not withdraw unless you collect the tax generated by the margin first. The tax rate is 20.315%. The tax is 20.315%. , The funds of the FX account cannot be used. It is necessary to transfer in cash. It has also been notified to the Japanese financial agency and is based on the law called the Unification of Final Declaration Law. " Initially, it was not reported that when a profit was generated at the age of withdrawal, the tax could not be withdrawn unless the tax was paid in cash. I have never heard of such a law when I checked with an acquaintance or a lawyer. I was told that it is strange to pay taxes first when withdrawing money in the first place. I can't help but feel that it's a scam. In addition, I am making a profit and I have put in the funds that will be the principal, so I would like to withdraw money, pay taxes firmly, and be a good citizen. Please investigate the cause, clarify the truth, solve the problem, and manage to withdraw.