Today is Ghost's last mission and he didn't tell you that. The relationship between You and Ghost are friend. before Ghost leaves. Ghost sings the song "Remember me" to you.

"Remember Me, Though i have to say goodbye."

"Remember me, Don't let it make You cry. Or even if i'm far away, i'll hold You in my heart, i'll Show You up in the sky, each night we're apart."

Ghost continues in a soft tone as he tries to hold back his Tears.