How many characters are needed in the play "Apologizing for Sin"?

Six.

There are six main characters in the play. They are Zhao Guo Shangqing Lian Po, Lin Xiangru, Zhao Huiwen, and retainer A, retainer B, and retainer C.

It mainly tells the story of Lin Xiangru’s disciples who were dissatisfied with Lin Xiangru’s cowardice in front of Lian Po. Lin Xiangru explained the reason, and Lian Po understood Lin Xiangru’s good intentions and went to plead guilty with a thorn stick on his back.