The Hiplife artist, whose real name is Theophilus Tagoe, went missing, along with friend Janet Bandu in July, 2014.
The two, went missing early July 2014, while surfing the waves at Ada in the Greater Accra Region.
Frantic search by the Marine Police did not yield any results as there was no trace of their bodies.
Commenting on the issue, an emotional Gyan said he hopes to see his friend again.
“Castro was a brother to me, he is such a talented guy.
“He never writes his music, he just sings them. I miss him so much”.
When asked by Bola Ray if he thinks Castro is dead or missing, Gyan said : “I don’t know, it’s only God that knows but sometimes I sit down and ask myself…Where is he?” he wondered.