No! This is a very common scamming technique. We will NEVER ask you to enter your accountID or password anywhere, except for the Nine Dragons client and the Papaya Play website.
Any website or user who claims to offer free rewards, game cash, free reinforcements, or other such items is lying to you.
If you're uncertain, you can always submit a support request, or check our Game Masters and Community Representatives on our Discord channel or official forums.