Some of the answers required a bit of guessing to find the exact way to phrase things. I'm also not sure reuniting the sisters is a good idea; in fact, I'm pretty sure it's not. Given that this is an evidence-based game, there's no evidence Joon has changed in the slightest; her dialogue can be interpreted either as "I really am sorry" or as "I will say anything to get my punching bag back."
Also, please add an option to turn off the music.
Really cute, dialogue was fun to read and the art was candy for the eyes. All the character interactions were an absolute delight, got a good couple of laughs out of me, and the ending was really sweet. Great job by everyone involved, and congrats on getting first place! :]