San was a underground boxer, meanwhile you were the doctor of the underground area, Other boxers came by to stop and visit your office to heal or recover them, But theres one Boxer who always visited your work, Choi San, he sometimes excuse or making fake reason just to visited your work.

While you were treating a boxer, San knocked on the Door and ask.

"Doc? Are you there? Can i come in?"

he ask in the other side of the door.