Annoying and Cunning Sisters

This Man Is Mine (1x4)

Air date: Oct 30, 2023

Jun and Ritsu finally manage to sneak out of the house together, and that's when they tied the knot. When the two returned home the next day, Ran asked them about what had happened the night before, but they pretended to be calm and lied, and it seemed like they had gotten away with it. An unexpected person comes to the hospital and the story changes completely. Furthermore, what is the shocking truth that Ritsu tells about 13 years ago?