I'm sorry, I don't have enough information to say who the main characters are. It could be various types of people, like a sinner seeking redemption, a keeper of the house of penance, or other people who are somehow connected to the place.
Since I haven't read the 'house of penance graphic novel', it's hard to determine the main characters. However, considering the theme, there might be a central character who is forced to enter the house of penance. This character could be a complex figure, perhaps with a troubled past that led them to this place. There could also be supporting characters such as other inmates in the penance house, or people from the outside world who have some connection to the main character's situation, like a family member or a person from their past who has some influence on their journey in the house of penance.
Without having read the graphic novel, it's difficult to be certain about the main characters. But based on the title, one can assume there could be a character who is in a state of moral conflict and is brought to the house of penance. This character might be conflicted between their past actions and their desire for redemption. There could also be a character who represents the authority in the house, someone who enforces the rules of penance. Additionally, there could be other characters who enter the house for different reasons, like some might be there because of false accusations, and their stories would intertwine with the main character's, creating a complex web of relationships within the setting of the house of penance.
Chapter 103 is the strongest chapter-level answer because it starts from Jiang Yan looked at Zhao Lang with suspicion, eyeing the dark substance in... and follows through on Jiang Yan felt deep guilt welling up inside him..
Look to Chapter 138 for the clearest answer. It begins with Is there such a good deal?, keeps building through Qi Tianyu quickly nodded in agreement and knelt down to start helping..., and lands on Could it be that the poison also had a side effect of making a person more....
If you want the clearest chapter reference, go to Chapter 112. Early on, These five people are supposed to be at odds.; later, the chapter leans on When did they become so in sync?] [I'm dying of laughter hahaha why is....
A practical answer is Chapter 129, because it turns the idea into a concrete scene. The chapter opens with When they saw that the live chat was full of praise for Jiang Li, those..., adds pressure through After a morning's labor, he hadn't planted more than the chicken had..., and ends on With.
If you want the clearest chapter reference, go to Chapter 114. Early on, As time passed, the number of viewers in the live broadcast gradually...; later, the chapter leans on After a whole day of trending searches yesterday, the popularity of....
Chapter 101 is the strongest chapter-level answer because it starts from Jiang Li walked over to the slope where the two had fallen down. and follows through on If you encounter any trouble in the future, you can come to me.. The payoff is that the chapter closes with Could it be...
Chapter 92 is the strongest chapter-level answer because it starts from Jiang Li, lightened from any task, had plucked a few leaves from the... and follows through on Finally, someone entrenched in the circle couldn't hold back and sent a....
If you want the clearest chapter reference, go to Chapter 141. Early on, It had happened in the afternoon when Aunt Ying's son and daughter heard...; later, the chapter leans on They went straight to Jiang Li's door and insisted on thanking her..
If you want the clearest chapter reference, go to Chapter 106. Early on, Thinking of this, He Yun nodded with a hint of anticipation.; later, the chapter leans on Alright, then tell me my fortune, what do I need to do?.
Look to Chapter 107 for the clearest answer. It begins with On the plane, when He Yun had taken off his mask and greeted her..., keeps building through She had also figured out his current predicament of being trapped by..., and lands on Although Su Yinwan's recent change in temperament had been.