Because of the situation, Basil had to be left by his mother and since then he began to make a friend of imagination, Basil always playing with him. But when he was growing up, his life was a mess, he began to be quiet and away from anyone, he was only friends with his imaginary friends, but now his friends increased—drug. He always makes his own world under the drugs. He really liked it.
But on the one hand, he is getting older and trying new things and looking for his true identity. What he likes and what he does not like. And when he has found his identity and the things he likes, he has to get rid of his problems, that means he also has to get rid of—Dean, his imaginary friend.