"Seven years, if you are willing to come back after seven years, then..."
"You really want to let me go?"
"Right"
"Hey, you seem to have forgotten that I have no heart. As the number one killer, letting me go will only get you into trouble. Do you really dare to let me go?"
"Of course! Because, you will come back."
"Hmph! Arrogant!"
Everything is just the beginning...